Calculus Examples

Evaluate the Limit limit as x approaches (pi/2) of tan(x)-sec(x)
Step 1
Set up the limit as a left-sided limit.
Step 2
Evaluate the limits by plugging in the value for the variable.
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Step 2.1
Evaluate the limit of by plugging in for .
Step 2.2
The exact value of is .
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Step 2.2.1
Split into two angles where the values of the six trigonometric functions are known.
Step 2.2.2
Apply the sum of angles identity.
Step 2.2.3
The exact value of is .
Step 2.2.4
The exact value of is .
Step 2.2.5
The exact value of is .
Step 2.2.6
The exact value of is .
Step 2.2.7
The exact value of is .
Step 2.2.8
The exact value of is .
Step 2.2.9
The exact value of is .
Step 2.2.10
The exact value of is .
Step 2.2.11
Simplify .
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Step 2.2.11.1
Simplify each term.
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Step 2.2.11.1.1
Multiply by .
Step 2.2.11.1.2
Combine and simplify the denominator.
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Step 2.2.11.1.2.1
Multiply by .
Step 2.2.11.1.2.2
Raise to the power of .
Step 2.2.11.1.2.3
Raise to the power of .
Step 2.2.11.1.2.4
Use the power rule to combine exponents.
Step 2.2.11.1.2.5
Add and .
Step 2.2.11.1.2.6
Rewrite as .
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Step 2.2.11.1.2.6.1
Use to rewrite as .
Step 2.2.11.1.2.6.2
Apply the power rule and multiply exponents, .
Step 2.2.11.1.2.6.3
Combine and .
Step 2.2.11.1.2.6.4
Cancel the common factor of .
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Step 2.2.11.1.2.6.4.1
Cancel the common factor.
Step 2.2.11.1.2.6.4.2
Rewrite the expression.
Step 2.2.11.1.2.6.5
Evaluate the exponent.
Step 2.2.11.1.3
Multiply .
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Step 2.2.11.1.3.1
Combine and .
Step 2.2.11.1.3.2
Multiply by .
Step 2.2.11.1.4
Multiply by .
Step 2.2.11.1.5
Combine and simplify the denominator.
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Step 2.2.11.1.5.1
Multiply by .
Step 2.2.11.1.5.2
Raise to the power of .
Step 2.2.11.1.5.3
Raise to the power of .
Step 2.2.11.1.5.4
Use the power rule to combine exponents.
Step 2.2.11.1.5.5
Add and .
Step 2.2.11.1.5.6
Rewrite as .
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Step 2.2.11.1.5.6.1
Use to rewrite as .
Step 2.2.11.1.5.6.2
Apply the power rule and multiply exponents, .
Step 2.2.11.1.5.6.3
Combine and .
Step 2.2.11.1.5.6.4
Cancel the common factor of .
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Step 2.2.11.1.5.6.4.1
Cancel the common factor.
Step 2.2.11.1.5.6.4.2
Rewrite the expression.
Step 2.2.11.1.5.6.5
Evaluate the exponent.
Step 2.2.11.1.6
Multiply .
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Step 2.2.11.1.6.1
Multiply by .
Step 2.2.11.1.6.2
Combine and .
Step 2.2.11.1.6.3
Multiply by .
Step 2.2.11.1.7
Move the negative in front of the fraction.
Step 2.2.11.2
Combine the numerators over the common denominator.
Step 2.2.11.3
Subtract from .
Step 2.2.11.4
Divide by .
Step 2.2.11.5
The expression contains a division by . The expression is undefined.
Undefined
Step 2.2.12
The expression contains a division by . The expression is undefined.
Undefined
Step 2.3
Since is undefined, the limit does not exist.
Step 3
Set up the limit as a right-sided limit.
Step 4
Evaluate the limits by plugging in the value for the variable.
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Step 4.1
Evaluate the limit of by plugging in for .
Step 4.2
The exact value of is .
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Step 4.2.1
Split into two angles where the values of the six trigonometric functions are known.
Step 4.2.2
Apply the sum of angles identity.
Step 4.2.3
The exact value of is .
Step 4.2.4
The exact value of is .
Step 4.2.5
The exact value of is .
Step 4.2.6
The exact value of is .
Step 4.2.7
The exact value of is .
Step 4.2.8
The exact value of is .
Step 4.2.9
The exact value of is .
Step 4.2.10
The exact value of is .
Step 4.2.11
Simplify .
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Step 4.2.11.1
Simplify each term.
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Step 4.2.11.1.1
Multiply by .
Step 4.2.11.1.2
Combine and simplify the denominator.
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Step 4.2.11.1.2.1
Multiply by .
Step 4.2.11.1.2.2
Raise to the power of .
Step 4.2.11.1.2.3
Raise to the power of .
Step 4.2.11.1.2.4
Use the power rule to combine exponents.
Step 4.2.11.1.2.5
Add and .
Step 4.2.11.1.2.6
Rewrite as .
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Step 4.2.11.1.2.6.1
Use to rewrite as .
Step 4.2.11.1.2.6.2
Apply the power rule and multiply exponents, .
Step 4.2.11.1.2.6.3
Combine and .
Step 4.2.11.1.2.6.4
Cancel the common factor of .
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Step 4.2.11.1.2.6.4.1
Cancel the common factor.
Step 4.2.11.1.2.6.4.2
Rewrite the expression.
Step 4.2.11.1.2.6.5
Evaluate the exponent.
Step 4.2.11.1.3
Multiply .
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Step 4.2.11.1.3.1
Combine and .
Step 4.2.11.1.3.2
Multiply by .
Step 4.2.11.1.4
Multiply by .
Step 4.2.11.1.5
Combine and simplify the denominator.
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Step 4.2.11.1.5.1
Multiply by .
Step 4.2.11.1.5.2
Raise to the power of .
Step 4.2.11.1.5.3
Raise to the power of .
Step 4.2.11.1.5.4
Use the power rule to combine exponents.
Step 4.2.11.1.5.5
Add and .
Step 4.2.11.1.5.6
Rewrite as .
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Step 4.2.11.1.5.6.1
Use to rewrite as .
Step 4.2.11.1.5.6.2
Apply the power rule and multiply exponents, .
Step 4.2.11.1.5.6.3
Combine and .
Step 4.2.11.1.5.6.4
Cancel the common factor of .
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Step 4.2.11.1.5.6.4.1
Cancel the common factor.
Step 4.2.11.1.5.6.4.2
Rewrite the expression.
Step 4.2.11.1.5.6.5
Evaluate the exponent.
Step 4.2.11.1.6
Multiply .
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Step 4.2.11.1.6.1
Multiply by .
Step 4.2.11.1.6.2
Combine and .
Step 4.2.11.1.6.3
Multiply by .
Step 4.2.11.1.7
Move the negative in front of the fraction.
Step 4.2.11.2
Combine the numerators over the common denominator.
Step 4.2.11.3
Subtract from .
Step 4.2.11.4
Divide by .
Step 4.2.11.5
The expression contains a division by . The expression is undefined.
Undefined
Step 4.2.12
The expression contains a division by . The expression is undefined.
Undefined
Step 4.3
Since is undefined, the limit does not exist.
Step 5
If either of the one-sided limits does not exist, the limit does not exist.