Question

$cos \: \: a = \frac{12}{13} \: than \: find \: \sin = \frac{b + c}{2} = \cos \frac{a}{2}$
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Answer 1

Answer:

Hey mate‼️

Cos a =12/13

Sin b+c/2 = Cos a/2

b+c/2 = 12/13/2

b+c/2 = 12/13 × 1/2

b+c/2 = 6/13

b+c = 6×2/13

b+c = 12/13.

•°• Sin b+c/2 = 12/13.

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