Precalculus Examples

$x = 7 \sin (1) + \sin (7 t)$ , $y = 7 \cos (t) + \cos (7 t)$

Step 1

Multiply $7$ by $\frac{\arcsin (x - 0.12216684)}{7}$ .

$y = 7 \cos (\frac{\arcsin (x - 0.12216684)}{7}) + \cos (7 (\frac{\arcsin (x - 0.12216684)}{7}))$

$t = \frac{\arcsin (x - 0.12216684)}{7}$

Step 2

Simplify $7 \cos (\frac{\arcsin (x - 0.12216684)}{7}) + \cos (7 (\frac{\arcsin (x - 0.12216684)}{7}))$ .

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Step 2.1

Simplify each term.

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Step 2.1.1

Cancel the common factor of $7$ .

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Step 2.1.1.1

Cancel the common factor.

$y = 7 \cos (\frac{\arcsin (x - 0.12216684)}{7}) + \cos (7 (\frac{\arcsin (x - 0.12216684)}{7}))$

$t = \frac{\arcsin (x - 0.12216684)}{7}$

Step 2.1.1.2

Rewrite the expression.

$y = 7 \cos (\frac{\arcsin (x - 0.12216684)}{7}) + \cos (\arcsin (x - 0.12216684))$

$t = \frac{\arcsin (x - 0.12216684)}{7}$

$y = 7 \cos (\frac{\arcsin (x - 0.12216684)}{7}) + \cos (\arcsin (x - 0.12216684))$

$t = \frac{\arcsin (x - 0.12216684)}{7}$

Step 2.1.2

Draw a triangle in the plane with vertices $(\sqrt{1^{2} - {(x - 0.12216684)}^{2}}, x - 0.12216684)$ , $(\sqrt{1^{2} - {(x - 0.12216684)}^{2}}, 0)$ , and the origin. Then $\arcsin (x - 0.12216684)$ is the angle between the positive x-axis and the ray beginning at the origin and passing through $(\sqrt{1^{2} - {(x - 0.12216684)}^{2}}, x - 0.12216684)$ . Therefore, $\cos (\arcsin (x - 0.12216684))$ is $\sqrt{1 - {(x - 0.12216684)}^{2}}$ .

$y = 7 \cos (\frac{\arcsin (x - 0.12216684)}{7}) + \sqrt{1 - {(x - 0.12216684)}^{2}}$

$t = \frac{\arcsin (x - 0.12216684)}{7}$

Step 2.1.3

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

$y = 7 \cos (\frac{\arcsin (x - 0.12216684)}{7}) + \sqrt{1^{2} - {(x - 0.12216684)}^{2}}$

$t = \frac{\arcsin (x - 0.12216684)}{7}$

Step 2.1.4

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 $b = x - 0.12216684$ .

$y = 7 \cos (\frac{\arcsin (x - 0.12216684)}{7}) + \sqrt{(1 + x - 0.12216684) (1 - (x - 0.12216684))}$

$t = \frac{\arcsin (x - 0.12216684)}{7}$

Step 2.1.5

Simplify.

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Step 2.1.5.1

Subtract $0.12216684$ from $1$ .

$y = 7 \cos (\frac{\arcsin (x - 0.12216684)}{7}) + \sqrt{(x + 0.87783315) (1 - (x - 0.12216684))}$

$t = \frac{\arcsin (x - 0.12216684)}{7}$

Step 2.1.5.2

Apply the distributive property.

$y = 7 \cos (\frac{\arcsin (x - 0.12216684)}{7}) + \sqrt{(x + 0.87783315) (1 - x + 0.12216684)}$

$t = \frac{\arcsin (x - 0.12216684)}{7}$

Step 2.1.5.3

Multiply $- 1$ by $- 0.12216684$ .

$y = 7 \cos (\frac{\arcsin (x - 0.12216684)}{7}) + \sqrt{(x + 0.87783315) (1 - x + 0.12216684)}$

$t = \frac{\arcsin (x - 0.12216684)}{7}$

Step 2.1.5.4

Add $1$ and $0.12216684$ .

$y = 7 \cos (\frac{\arcsin (x - 0.12216684)}{7}) + \sqrt{(x + 0.87783315) (- x + 1.12216684)}$

$t = \frac{\arcsin (x - 0.12216684)}{7}$

$y = 7 \cos (\frac{\arcsin (x - 0.12216684)}{7}) + \sqrt{(x + 0.87783315) (- x + 1.12216684)}$

$t = \frac{\arcsin (x - 0.12216684)}{7}$

$y = 7 \cos (\frac{\arcsin (x - 0.12216684)}{7}) + \sqrt{(x + 0.87783315) (- x + 1.12216684)}$

$t = \frac{\arcsin (x - 0.12216684)}{7}$

Step 2.2

Reorder $7 \cos (\frac{\arcsin (x - 0.12216684)}{7})$ and $\sqrt{(x + 0.87783315) (- x + 1.12216684)}$ .

$y = \sqrt{(x + 0.87783315) (- x + 1.12216684)} + 7 \cos (\frac{\arcsin (x - 0.12216684)}{7})$

$t = \frac{\arcsin (x - 0.12216684)}{7}$

$y = \sqrt{(x + 0.87783315) (- x + 1.12216684)} + 7 \cos (\frac{\arcsin (x - 0.12216684)}{7})$

$t = \frac{\arcsin (x - 0.12216684)}{7}$