- Show that sin A+sin B=2sin((A+B)/(2))cos((A-B)/(2)). - Hence find the exact value of sin((75)/(2))

Question

- Show that sin A+sin B=2sin((A+B)/(2))cos((A-B)/(2)). - Hence find the exact value of sin((75)/(2))cos((15)/(2)).

Accepted Answer

(b) $\frac{\sqrt2+1}{4}$.

IB Math HL Trigonometry Test 6 2018 P2 Q6