Precalculus Examples

$x = - 5 \sin (4 t)$ , $y = 5 \cos (4 t)$

Step 1

Solve the equation for $t$ .

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Step 1.1

Rewrite the equation as $- 5 \sin (4 t) = x$ .

$- 5 \sin (4 t) = x$

$y = 5 \cos (4 t)$

Step 1.2

Divide each term in $- 5 \sin (4 t) = x$ by $- 5$ and simplify.

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Step 1.2.1

Divide each term in $- 5 \sin (4 t) = x$ by $- 5$ .

$\frac{- 5 \sin (4 t)}{- 5} = \frac{x}{- 5}$

$y = 5 \cos (4 t)$

Step 1.2.2

Simplify the left side.

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Step 1.2.2.1

Cancel the common factor of $- 5$ .

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Step 1.2.2.1.1

Cancel the common factor.

$\frac{- 5 \sin (4 t)}{- 5} = \frac{x}{- 5}$

$y = 5 \cos (4 t)$

Step 1.2.2.1.2

Divide $\sin (4 t)$ by $1$ .

$\sin (4 t) = \frac{x}{- 5}$

$y = 5 \cos (4 t)$

$\sin (4 t) = \frac{x}{- 5}$

$y = 5 \cos (4 t)$

$\sin (4 t) = \frac{x}{- 5}$

$y = 5 \cos (4 t)$

Step 1.2.3

Simplify the right side.

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Step 1.2.3.1

Move the negative in front of the fraction.

$\sin (4 t) = - \frac{x}{5}$

$y = 5 \cos (4 t)$

$\sin (4 t) = - \frac{x}{5}$

$y = 5 \cos (4 t)$

$\sin (4 t) = - \frac{x}{5}$

$y = 5 \cos (4 t)$

Step 1.3

Take the inverse sine of both sides of the equation to extract $t$ from inside the sine.

$4 t = \arcsin (- \frac{x}{5})$

$y = 5 \cos (4 t)$

Step 1.4

Divide each term in $4 t = \arcsin (- \frac{x}{5})$ by $4$ and simplify.

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Step 1.4.1

Divide each term in $4 t = \arcsin (- \frac{x}{5})$ by $4$ .

$\frac{4 t}{4} = \frac{\arcsin (- \frac{x}{5})}{4}$

$y = 5 \cos (4 t)$

Step 1.4.2

Simplify the left side.

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Step 1.4.2.1

Cancel the common factor of $4$ .

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Step 1.4.2.1.1

Cancel the common factor.

$\frac{4 t}{4} = \frac{\arcsin (- \frac{x}{5})}{4}$

$y = 5 \cos (4 t)$

Step 1.4.2.1.2

Divide $t$ by $1$ .

$t = \frac{\arcsin (- \frac{x}{5})}{4}$

$y = 5 \cos (4 t)$

$t = \frac{\arcsin (- \frac{x}{5})}{4}$

$y = 5 \cos (4 t)$

$t = \frac{\arcsin (- \frac{x}{5})}{4}$

$y = 5 \cos (4 t)$

$t = \frac{\arcsin (- \frac{x}{5})}{4}$

$y = 5 \cos (4 t)$

$t = \frac{\arcsin (- \frac{x}{5})}{4}$

$y = 5 \cos (4 t)$

Step 2

Simplify the right side.

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Step 2.1

Simplify $\frac{\arcsin (- \frac{- 5 \sin (4 t)}{5})}{4}$ .

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Step 2.1.1

Cancel the common factor of $- 5$ and $5$ .

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Step 2.1.1.1

Factor $5$ out of $- 5 \sin (4 t)$ .

$t = \frac{\arcsin (- \frac{5 (- \sin (4 t))}{5})}{4}$

$y = 5 \cos (4 t)$

Step 2.1.1.2

Cancel the common factors.

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Step 2.1.1.2.1

Factor $5$ out of $5$ .

$t = \frac{\arcsin (- \frac{5 (- \sin (4 t))}{5 (1)})}{4}$

$y = 5 \cos (4 t)$

Step 2.1.1.2.2

Cancel the common factor.

$t = \frac{\arcsin (- \frac{5 (- \sin (4 t))}{5 \cdot 1})}{4}$

$y = 5 \cos (4 t)$

Step 2.1.1.2.3

Rewrite the expression.

$t = \frac{\arcsin (- \frac{- \sin (4 t)}{1})}{4}$

$y = 5 \cos (4 t)$

Step 2.1.1.2.4

Divide $- \sin (4 t)$ by $1$ .

$t = \frac{\arcsin (\sin (4 t))}{4}$

$y = 5 \cos (4 t)$

$t = \frac{\arcsin (\sin (4 t))}{4}$

$y = 5 \cos (4 t)$

$t = \frac{\arcsin (\sin (4 t))}{4}$

$y = 5 \cos (4 t)$

Step 2.1.2

Multiply $- - \sin (4 t)$ .

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Step 2.1.2.1

Multiply $- 1$ by $- 1$ .

$t = \frac{\arcsin (1 \sin (4 t))}{4}$

$y = 5 \cos (4 t)$

Step 2.1.2.2

Multiply $\sin (4 t)$ by $1$ .

$t = \frac{\arcsin (\sin (4 t))}{4}$

$y = 5 \cos (4 t)$

$t = \frac{\arcsin (\sin (4 t))}{4}$

$y = 5 \cos (4 t)$

$t = \frac{\arcsin (\sin (4 t))}{4}$

$y = 5 \cos (4 t)$

$t = \frac{\arcsin (\sin (4 t))}{4}$

$y = 5 \cos (4 t)$

Step 3

Simplify the right side.

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Step 3.1

Simplify $5 \cos (4 (\frac{\arcsin (\sin (4 t))}{4}))$ .

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Step 3.1.1

Reduce the expression by cancelling the common factors.

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Step 3.1.1.1

Cancel the common factor of $4$ .

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Step 3.1.1.1.1

Cancel the common factor.

$y = 5 \cos (4 (\frac{\arcsin (\sin (4 t))}{4}))$

$t = \frac{\arcsin (\sin (4 t))}{4}$

Step 3.1.1.1.2

Rewrite the expression.

$y = 5 \cos (\arcsin (\sin (4 t)))$

$t = \frac{\arcsin (\sin (4 t))}{4}$

$y = 5 \cos (\arcsin (\sin (4 t)))$

$t = \frac{\arcsin (\sin (4 t))}{4}$

Step 3.1.1.2

Write the expression using exponents.

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Step 3.1.1.2.1

Draw a triangle in the plane with vertices $(\sqrt{1^{2} - \sin^{2} (4 t)}, \sin (4 t))$ , $(\sqrt{1^{2} - \sin^{2} (4 t)}, 0)$ , and the origin. Then $\arcsin (\sin (4 t))$ is the angle between the positive x-axis and the ray beginning at the origin and passing through $(\sqrt{1^{2} - \sin^{2} (4 t)}, \sin (4 t))$ . Therefore, $\cos (\arcsin (\sin (4 t)))$ is $\sqrt{1 - \sin^{2} (4 t)}$ .

$y = 5 \sqrt{1 - \sin^{2} (4 t)}$

$t = \frac{\arcsin (\sin (4 t))}{4}$

Step 3.1.1.2.2

Rewrite $1$ as $1^{2}$ .

$y = 5 \sqrt{1^{2} - \sin^{2} (4 t)}$

$t = \frac{\arcsin (\sin (4 t))}{4}$

$y = 5 \sqrt{1^{2} - \sin^{2} (4 t)}$

$t = \frac{\arcsin (\sin (4 t))}{4}$

$y = 5 \sqrt{1^{2} - \sin^{2} (4 t)}$

$t = \frac{\arcsin (\sin (4 t))}{4}$

Step 3.1.2

Since both terms are perfect squares, factor using the difference of squares formula, $a^{2} - b^{2} = (a + b) (a - b)$ where $a = 1$ and $b = \sin (4 t)$ .

$y = 5 \sqrt{(1 + \sin (4 t)) (1 - \sin (4 t))}$

$t = \frac{\arcsin (\sin (4 t))}{4}$

$y = 5 \sqrt{(1 + \sin (4 t)) (1 - \sin (4 t))}$

$t = \frac{\arcsin (\sin (4 t))}{4}$

$y = 5 \sqrt{(1 + \sin (4 t)) (1 - \sin (4 t))}$

$t = \frac{\arcsin (\sin (4 t))}{4}$

Step 4

Reduce the system.

$y = 5 \sqrt{(1 + \sin (4 (- \frac{1}{5}, 0, 0.1, 0.3))) (1 - \sin (4 (- \frac{1}{5}, 0, 0.1, 0.3)))}$

$t = \frac{\arcsin (\sin (4 t))}{4}$

Step 5

Simplify the right side.

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Step 5.1

Simplify $5 \sqrt{(1 + \sin (4 (- \frac{1}{5}, 0, 0.1, 0.3))) (1 - \sin (4 (- \frac{1}{5}, 0, 0.1, 0.3)))}$ .

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Step 5.1.1

Multiply $4$ by each element of the matrix.

$y = 5 \sqrt{(1 + \sin ((4 (- \frac{1}{5}), 4 \cdot 0, 4 \cdot 0.1, 4 \cdot 0.3))) (1 - \sin (4 (- \frac{1}{5}, 0, 0.1, 0.3)))}$

$t = \frac{\arcsin (\sin (4 t))}{4}$

Step 5.1.2

Simplify each element in the matrix.

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Step 5.1.2.1

Multiply $4 (- \frac{1}{5})$ .

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Step 5.1.2.1.1

Multiply $- 1$ by $4$ .

$y = 5 \sqrt{(1 + \sin ((- 4 (\frac{1}{5}), 4 \cdot 0, 4 \cdot 0.1, 4 \cdot 0.3))) (1 - \sin (4 (- \frac{1}{5}, 0, 0.1, 0.3)))}$

$t = \frac{\arcsin (\sin (4 t))}{4}$

Step 5.1.2.1.2

Combine $- 4$ and $\frac{1}{5}$ .

$y = 5 \sqrt{(1 + \sin ((\frac{- 4}{5}, 4 \cdot 0, 4 \cdot 0.1, 4 \cdot 0.3))) (1 - \sin (4 (- \frac{1}{5}, 0, 0.1, 0.3)))}$

$t = \frac{\arcsin (\sin (4 t))}{4}$

$y = 5 \sqrt{(1 + \sin ((\frac{- 4}{5}, 4 \cdot 0, 4 \cdot 0.1, 4 \cdot 0.3))) (1 - \sin (4 (- \frac{1}{5}, 0, 0.1, 0.3)))}$

$t = \frac{\arcsin (\sin (4 t))}{4}$

Step 5.1.2.2

Move the negative in front of the fraction.

$y = 5 \sqrt{(1 + \sin ((- \frac{4}{5}, 4 \cdot 0, 4 \cdot 0.1, 4 \cdot 0.3))) (1 - \sin (4 (- \frac{1}{5}, 0, 0.1, 0.3)))}$

$t = \frac{\arcsin (\sin (4 t))}{4}$

Step 5.1.2.3

Multiply $4$ by $0$ .

$y = 5 \sqrt{(1 + \sin ((- \frac{4}{5}, 0, 4 \cdot 0.1, 4 \cdot 0.3))) (1 - \sin (4 (- \frac{1}{5}, 0, 0.1, 0.3)))}$

$t = \frac{\arcsin (\sin (4 t))}{4}$

Step 5.1.2.4

Multiply $4$ by $0.1$ .

$y = 5 \sqrt{(1 + \sin ((- \frac{4}{5}, 0, 0.4, 4 \cdot 0.3))) (1 - \sin (4 (- \frac{1}{5}, 0, 0.1, 0.3)))}$

$t = \frac{\arcsin (\sin (4 t))}{4}$

Step 5.1.2.5

Multiply $4$ by $0.3$ .

$y = 5 \sqrt{(1 + \sin ((- \frac{4}{5}, 0, 0.4, 1.2))) (1 - \sin (4 (- \frac{1}{5}, 0, 0.1, 0.3)))}$

$t = \frac{\arcsin (\sin (4 t))}{4}$

$y = 5 \sqrt{(1 + \sin ((- \frac{4}{5}, 0, 0.4, 1.2))) (1 - \sin (4 (- \frac{1}{5}, 0, 0.1, 0.3)))}$

$t = \frac{\arcsin (\sin (4 t))}{4}$

Step 5.1.3

Multiply $4$ by each element of the matrix.

$y = 5 \sqrt{(1 + \sin ((- \frac{4}{5}, 0, 0.4, 1.2))) (1 - \sin ((4 (- \frac{1}{5}), 4 \cdot 0, 4 \cdot 0.1, 4 \cdot 0.3)))}$

$t = \frac{\arcsin (\sin (4 t))}{4}$

Step 5.1.4

Simplify each element in the matrix.

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Step 5.1.4.1

Multiply $4 (- \frac{1}{5})$ .

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Step 5.1.4.1.1

Multiply $- 1$ by $4$ .

$y = 5 \sqrt{(1 + \sin ((- \frac{4}{5}, 0, 0.4, 1.2))) (1 - \sin ((- 4 (\frac{1}{5}), 4 \cdot 0, 4 \cdot 0.1, 4 \cdot 0.3)))}$

$t = \frac{\arcsin (\sin (4 t))}{4}$

Step 5.1.4.1.2

Combine $- 4$ and $\frac{1}{5}$ .

$y = 5 \sqrt{(1 + \sin ((- \frac{4}{5}, 0, 0.4, 1.2))) (1 - \sin ((\frac{- 4}{5}, 4 \cdot 0, 4 \cdot 0.1, 4 \cdot 0.3)))}$

$t = \frac{\arcsin (\sin (4 t))}{4}$

$y = 5 \sqrt{(1 + \sin ((- \frac{4}{5}, 0, 0.4, 1.2))) (1 - \sin ((\frac{- 4}{5}, 4 \cdot 0, 4 \cdot 0.1, 4 \cdot 0.3)))}$

$t = \frac{\arcsin (\sin (4 t))}{4}$

Step 5.1.4.2

Move the negative in front of the fraction.

$y = 5 \sqrt{(1 + \sin ((- \frac{4}{5}, 0, 0.4, 1.2))) (1 - \sin ((- \frac{4}{5}, 4 \cdot 0, 4 \cdot 0.1, 4 \cdot 0.3)))}$

$t = \frac{\arcsin (\sin (4 t))}{4}$

Step 5.1.4.3

Multiply $4$ by $0$ .

$y = 5 \sqrt{(1 + \sin ((- \frac{4}{5}, 0, 0.4, 1.2))) (1 - \sin ((- \frac{4}{5}, 0, 4 \cdot 0.1, 4 \cdot 0.3)))}$

$t = \frac{\arcsin (\sin (4 t))}{4}$

Step 5.1.4.4

Multiply $4$ by $0.1$ .

$y = 5 \sqrt{(1 + \sin ((- \frac{4}{5}, 0, 0.4, 1.2))) (1 - \sin ((- \frac{4}{5}, 0, 0.4, 4 \cdot 0.3)))}$

$t = \frac{\arcsin (\sin (4 t))}{4}$

Step 5.1.4.5

Multiply $4$ by $0.3$ .

$y = 5 \sqrt{(1 + \sin ((- \frac{4}{5}, 0, 0.4, 1.2))) (1 - \sin ((- \frac{4}{5}, 0, 0.4, 1.2)))}$

$t = \frac{\arcsin (\sin (4 t))}{4}$

$y = 5 \sqrt{(1 + \sin ((- \frac{4}{5}, 0, 0.4, 1.2))) (1 - \sin ((- \frac{4}{5}, 0, 0.4, 1.2)))}$

$t = \frac{\arcsin (\sin (4 t))}{4}$

$y = 5 \sqrt{(1 + \sin ((- \frac{4}{5}, 0, 0.4, 1.2))) (1 - \sin ((- \frac{4}{5}, 0, 0.4, 1.2)))}$

$t = \frac{\arcsin (\sin (4 t))}{4}$

$y = 5 \sqrt{(1 + \sin ((- \frac{4}{5}, 0, 0.4, 1.2))) (1 - \sin ((- \frac{4}{5}, 0, 0.4, 1.2)))}$

$t = \frac{\arcsin (\sin (4 t))}{4}$