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(Solved): How do you solve these? 3. If cos=5,2<<. Find sin2. 4. If sin=3/5,32 ...

How do you solve these?

$3. If \( \cos \alpha=-\frac{5}{\theta}, \frac{\pi}{2}<\alpha<\pi \). Find \( \sin \frac{\alpha}{2} \). 4. If \( \sin \alpha=3$

3. If

cos ? = ? \frac{5}{?}, \frac{?}{2} < ? < ?

. Find

sin \frac{?}{2}

. 4. If

sin ? = 3/5, 3 \frac{?}{2} < ? < ?

. Find

cos \frac{a}{2}

.

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3)Given cos??=?58 and ?2

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