Question

I want the answer of question no. 6....

Answer 1

Answer:

Step-by-step explanation:

A+B+C =180

B+C=180 -A

Sin (B+C/2) =Cos (90 - (B+C/2))

=Cos (90 - (180-A)/2)

=Cos (180 - 180 + A /2)

= Cos ( A/2)

Answer 2

Gd mrng.
Hope it helps u mate!!!!!