Use the Trigonometric Substitution to Rewrite the Algebraic Expression as a Trigonometric

question 38

Multiple Choice

Use the trigonometric substitution to rewrite the algebraic expression as a trigonometric function of $\theta$ , where $- \frac { \pi } { 2 } < \theta < \frac { \pi } { 2 }$ .Then find sin $\theta$ and cos $\theta$ .
$4 = \sqrt { 64 - x ^ { 2 } } , x = 8 \sin \theta$

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