Question

If A, B, C are the interior angles of a triangle ABC, show that : a) Cos A+B/2 =Sin C/2

please give the answer
If you will give the right answer then I will mark you as a brainliest and I will give you 5
please give the answer
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Answer 1

A+B+C=180

A+B=180-C

A+B/2=90-C/2

Sin(A+B/2)=COS(90-C/2)

Sin(A+B/2)=CosA/2

Hence,Proved