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Pythagorean Identity With Sine and Cosine

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Let $\alpha$ be an angle in quadrant I. If $\sin(\alpha) = \frac{3}{5}$ , what is the value of $\cos(\alpha)$ ?

A

$\frac{3}{5}$

B

$\frac{1}{5}$

C

$\frac{4}{5}$

D

$\frac{2}{5}$

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