Calculus Examples

Find the Absolute Max and Min over the Interval f(x) = square root of 4-x^2
Step 1
Find the first derivative of the function.
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Step 1.1
Use to rewrite as .
Step 1.2
Differentiate using the chain rule, which states that is where and .
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Step 1.2.1
To apply the Chain Rule, set as .
Step 1.2.2
Differentiate using the Power Rule which states that is where .
Step 1.2.3
Replace all occurrences of with .
Step 1.3
To write as a fraction with a common denominator, multiply by .
Step 1.4
Combine and .
Step 1.5
Combine the numerators over the common denominator.
Step 1.6
Simplify the numerator.
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Step 1.6.1
Multiply by .
Step 1.6.2
Subtract from .
Step 1.7
Combine fractions.
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Step 1.7.1
Move the negative in front of the fraction.
Step 1.7.2
Combine and .
Step 1.7.3
Move to the denominator using the negative exponent rule .
Step 1.8
By the Sum Rule, the derivative of with respect to is .
Step 1.9
Since is constant with respect to , the derivative of with respect to is .
Step 1.10
Add and .
Step 1.11
Since is constant with respect to , the derivative of with respect to is .
Step 1.12
Differentiate using the Power Rule which states that is where .
Step 1.13
Simplify terms.
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Step 1.13.1
Multiply by .
Step 1.13.2
Combine and .
Step 1.13.3
Combine and .
Step 1.13.4
Factor out of .
Step 1.14
Cancel the common factors.
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Step 1.14.1
Factor out of .
Step 1.14.2
Cancel the common factor.
Step 1.14.3
Rewrite the expression.
Step 1.15
Move the negative in front of the fraction.
Step 2
Find the second derivative of the function.
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Step 2.1
Differentiate using the Product Rule which states that is where and .
Step 2.2
Differentiate using the Quotient Rule which states that is where and .
Step 2.3
Multiply the exponents in .
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Step 2.3.1
Apply the power rule and multiply exponents, .
Step 2.3.2
Cancel the common factor of .
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Step 2.3.2.1
Cancel the common factor.
Step 2.3.2.2
Rewrite the expression.
Step 2.4
Simplify.
Step 2.5
Differentiate using the Power Rule.
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Step 2.5.1
Differentiate using the Power Rule which states that is where .
Step 2.5.2
Multiply by .
Step 2.6
Differentiate using the chain rule, which states that is where and .
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Step 2.6.1
To apply the Chain Rule, set as .
Step 2.6.2
Differentiate using the Power Rule which states that is where .
Step 2.6.3
Replace all occurrences of with .
Step 2.7
To write as a fraction with a common denominator, multiply by .
Step 2.8
Combine and .
Step 2.9
Combine the numerators over the common denominator.
Step 2.10
Simplify the numerator.
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Step 2.10.1
Multiply by .
Step 2.10.2
Subtract from .
Step 2.11
Combine fractions.
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Step 2.11.1
Move the negative in front of the fraction.
Step 2.11.2
Combine and .
Step 2.11.3
Move to the denominator using the negative exponent rule .
Step 2.11.4
Combine and .
Step 2.12
By the Sum Rule, the derivative of with respect to is .
Step 2.13
Since is constant with respect to , the derivative of with respect to is .
Step 2.14
Add and .
Step 2.15
Since is constant with respect to , the derivative of with respect to is .
Step 2.16
Multiply.
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Step 2.16.1
Multiply by .
Step 2.16.2
Multiply by .
Step 2.17
Differentiate using the Power Rule which states that is where .
Step 2.18
Combine fractions.
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Step 2.18.1
Combine and .
Step 2.18.2
Combine and .
Step 2.19
Raise to the power of .
Step 2.20
Raise to the power of .
Step 2.21
Use the power rule to combine exponents.
Step 2.22
Add and .
Step 2.23
Cancel the common factor.
Step 2.24
Rewrite the expression.
Step 2.25
To write as a fraction with a common denominator, multiply by .
Step 2.26
Combine the numerators over the common denominator.
Step 2.27
Multiply by by adding the exponents.
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Step 2.27.1
Use the power rule to combine exponents.
Step 2.27.2
Combine the numerators over the common denominator.
Step 2.27.3
Add and .
Step 2.27.4
Divide by .
Step 2.28
Simplify .
Step 2.29
Add and .
Step 2.30
Add and .
Step 2.31
Rewrite as a product.
Step 2.32
Multiply by .
Step 2.33
Multiply by by adding the exponents.
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Step 2.33.1
Multiply by .
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Step 2.33.1.1
Raise to the power of .
Step 2.33.1.2
Use the power rule to combine exponents.
Step 2.33.2
Write as a fraction with a common denominator.
Step 2.33.3
Combine the numerators over the common denominator.
Step 2.33.4
Add and .
Step 2.34
Since is constant with respect to , the derivative of with respect to is .
Step 2.35
Simplify the expression.
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Step 2.35.1
Multiply by .
Step 2.35.2
Add and .
Step 3
To find the local maximum and minimum values of the function, set the derivative equal to and solve.
Step 4
Find the first derivative.
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Step 4.1
Find the first derivative.
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Step 4.1.1
Use to rewrite as .
Step 4.1.2
Differentiate using the chain rule, which states that is where and .
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Step 4.1.2.1
To apply the Chain Rule, set as .
Step 4.1.2.2
Differentiate using the Power Rule which states that is where .
Step 4.1.2.3
Replace all occurrences of with .
Step 4.1.3
To write as a fraction with a common denominator, multiply by .
Step 4.1.4
Combine and .
Step 4.1.5
Combine the numerators over the common denominator.
Step 4.1.6
Simplify the numerator.
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Step 4.1.6.1
Multiply by .
Step 4.1.6.2
Subtract from .
Step 4.1.7
Combine fractions.
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Step 4.1.7.1
Move the negative in front of the fraction.
Step 4.1.7.2
Combine and .
Step 4.1.7.3
Move to the denominator using the negative exponent rule .
Step 4.1.8
By the Sum Rule, the derivative of with respect to is .
Step 4.1.9
Since is constant with respect to , the derivative of with respect to is .
Step 4.1.10
Add and .
Step 4.1.11
Since is constant with respect to , the derivative of with respect to is .
Step 4.1.12
Differentiate using the Power Rule which states that is where .
Step 4.1.13
Simplify terms.
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Step 4.1.13.1
Multiply by .
Step 4.1.13.2
Combine and .
Step 4.1.13.3
Combine and .
Step 4.1.13.4
Factor out of .
Step 4.1.14
Cancel the common factors.
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Step 4.1.14.1
Factor out of .
Step 4.1.14.2
Cancel the common factor.
Step 4.1.14.3
Rewrite the expression.
Step 4.1.15
Move the negative in front of the fraction.
Step 4.2
The first derivative of with respect to is .
Step 5
Set the first derivative equal to then solve the equation .
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Step 5.1
Set the first derivative equal to .
Step 5.2
Set the numerator equal to zero.
Step 6
Find the values where the derivative is undefined.
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Step 6.1
Convert expressions with fractional exponents to radicals.
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Step 6.1.1
Apply the rule to rewrite the exponentiation as a radical.
Step 6.1.2
Anything raised to is the base itself.
Step 6.2
Set the denominator in equal to to find where the expression is undefined.
Step 6.3
Solve for .
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Step 6.3.1
To remove the radical on the left side of the equation, square both sides of the equation.
Step 6.3.2
Simplify each side of the equation.
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Step 6.3.2.1
Use to rewrite as .
Step 6.3.2.2
Simplify the left side.
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Step 6.3.2.2.1
Simplify .
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Step 6.3.2.2.1.1
Multiply the exponents in .
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Step 6.3.2.2.1.1.1
Apply the power rule and multiply exponents, .
Step 6.3.2.2.1.1.2
Cancel the common factor of .
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Step 6.3.2.2.1.1.2.1
Cancel the common factor.
Step 6.3.2.2.1.1.2.2
Rewrite the expression.
Step 6.3.2.2.1.2
Simplify.
Step 6.3.2.3
Simplify the right side.
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Step 6.3.2.3.1
Raising to any positive power yields .
Step 6.3.3
Solve for .
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Step 6.3.3.1
Subtract from both sides of the equation.
Step 6.3.3.2
Divide each term in by and simplify.
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Step 6.3.3.2.1
Divide each term in by .
Step 6.3.3.2.2
Simplify the left side.
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Step 6.3.3.2.2.1
Dividing two negative values results in a positive value.
Step 6.3.3.2.2.2
Divide by .
Step 6.3.3.2.3
Simplify the right side.
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Step 6.3.3.2.3.1
Divide by .
Step 6.3.3.3
Take the specified root of both sides of the equation to eliminate the exponent on the left side.
Step 6.3.3.4
Simplify .
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Step 6.3.3.4.1
Rewrite as .
Step 6.3.3.4.2
Pull terms out from under the radical, assuming positive real numbers.
Step 6.3.3.5
The complete solution is the result of both the positive and negative portions of the solution.
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Step 6.3.3.5.1
First, use the positive value of the to find the first solution.
Step 6.3.3.5.2
Next, use the negative value of the to find the second solution.
Step 6.3.3.5.3
The complete solution is the result of both the positive and negative portions of the solution.
Step 6.4
Set the radicand in less than to find where the expression is undefined.
Step 6.5
Solve for .
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Step 6.5.1
Subtract from both sides of the inequality.
Step 6.5.2
Divide each term in by and simplify.
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Step 6.5.2.1
Divide each term in by . When multiplying or dividing both sides of an inequality by a negative value, flip the direction of the inequality sign.
Step 6.5.2.2
Simplify the left side.
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Step 6.5.2.2.1
Dividing two negative values results in a positive value.
Step 6.5.2.2.2
Divide by .
Step 6.5.2.3
Simplify the right side.
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Step 6.5.2.3.1
Divide by .
Step 6.5.3
Take the specified root of both sides of the inequality to eliminate the exponent on the left side.
Step 6.5.4
Simplify the equation.
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Step 6.5.4.1
Simplify the left side.
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Step 6.5.4.1.1
Pull terms out from under the radical.
Step 6.5.4.2
Simplify the right side.
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Step 6.5.4.2.1
Simplify .
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Step 6.5.4.2.1.1
Rewrite as .
Step 6.5.4.2.1.2
Pull terms out from under the radical.
Step 6.5.4.2.1.3
The absolute value is the distance between a number and zero. The distance between and is .
Step 6.5.5
Write as a piecewise.
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Step 6.5.5.1
To find the interval for the first piece, find where the inside of the absolute value is non-negative.
Step 6.5.5.2
In the piece where is non-negative, remove the absolute value.
Step 6.5.5.3
To find the interval for the second piece, find where the inside of the absolute value is negative.
Step 6.5.5.4
In the piece where is negative, remove the absolute value and multiply by .
Step 6.5.5.5
Write as a piecewise.
Step 6.5.6
Find the intersection of and .
Step 6.5.7
Divide each term in by and simplify.
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Step 6.5.7.1
Divide each term in by . When multiplying or dividing both sides of an inequality by a negative value, flip the direction of the inequality sign.
Step 6.5.7.2
Simplify the left side.
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Step 6.5.7.2.1
Dividing two negative values results in a positive value.
Step 6.5.7.2.2
Divide by .
Step 6.5.7.3
Simplify the right side.
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Step 6.5.7.3.1
Divide by .
Step 6.5.8
Find the union of the solutions.
or
or
Step 6.6
The equation is undefined where the denominator equals , the argument of a square root is less than , or the argument of a logarithm is less than or equal to .
Step 7
Critical points to evaluate.
Step 8
Evaluate the second derivative at . If the second derivative is positive, then this is a local minimum. If it is negative, then this is a local maximum.
Step 9
Evaluate the second derivative.
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Step 9.1
Simplify the denominator.
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Step 9.1.1
Simplify each term.
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Step 9.1.1.1
Raising to any positive power yields .
Step 9.1.1.2
Multiply by .
Step 9.1.2
Add and .
Step 9.1.3
Rewrite as .
Step 9.1.4
Apply the power rule and multiply exponents, .
Step 9.1.5
Cancel the common factor of .
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Step 9.1.5.1
Cancel the common factor.
Step 9.1.5.2
Rewrite the expression.
Step 9.1.6
Raise to the power of .
Step 9.2
Cancel the common factor of and .
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Step 9.2.1
Factor out of .
Step 9.2.2
Cancel the common factors.
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Step 9.2.2.1
Factor out of .
Step 9.2.2.2
Cancel the common factor.
Step 9.2.2.3
Rewrite the expression.
Step 10
is a local maximum because the value of the second derivative is negative. This is referred to as the second derivative test.
is a local maximum
Step 11
Find the y-value when .
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Step 11.1
Replace the variable with in the expression.
Step 11.2
Simplify the result.
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Step 11.2.1
Raising to any positive power yields .
Step 11.2.2
Multiply by .
Step 11.2.3
Add and .
Step 11.2.4
Rewrite as .
Step 11.2.5
Pull terms out from under the radical, assuming positive real numbers.
Step 11.2.6
The final answer is .
Step 12
Evaluate the second derivative at . If the second derivative is positive, then this is a local minimum. If it is negative, then this is a local maximum.
Step 13
Evaluate the second derivative.
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Step 13.1
Simplify each term.
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Step 13.1.1
Raise to the power of .
Step 13.1.2
Multiply by .
Step 13.2
Reduce the expression by cancelling the common factors.
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Step 13.2.1
Subtract from .
Step 13.2.2
Simplify the expression.
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Step 13.2.2.1
Rewrite as .
Step 13.2.2.2
Apply the power rule and multiply exponents, .
Step 13.2.3
Cancel the common factor of .
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Step 13.2.3.1
Cancel the common factor.
Step 13.2.3.2
Rewrite the expression.
Step 13.2.4
Raising to any positive power yields .
Step 13.2.5
The expression contains a division by . The expression is undefined.
Undefined
Step 13.3
The expression contains a division by . The expression is undefined.
Undefined
Undefined
Step 14
Since the first derivative test failed, there are no local extrema.
No Local Extrema
Step 15