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(Solved): Suppose that cos=54 and 2<<. Find the exact values of cos2 and tan2 ...

$Suppose that \( \cos \alpha=-\frac{4}{5} \) and \( \frac{\pi}{2}<\alpha<\pi \). Find the exact values of \( \cos \frac{\alpha$

Suppose that

cos ? = ? \frac{4}{5}

and

\frac{?}{2} < ? < ?

. Find the exact values of

cos \frac{?}{2}

and

tan \frac{?}{2}

.

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We are given:cos??=?45Use the definition of cosine to find the known sides of the unit circle right triangle. The quadrant determines the sign on each

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