if A, B and C are interior angles of a `triangle` ABC, then show that `cos((B+C)/2)` = `sin (A/2)`

If A, B and C are interior angles of a triangle ABC, then show that "sin"((B+C)/2)=cosA/2 .

If A, B and C are interior angles of a triangle ABC, then show that "sin"((B+C)/2)=cos(A/2) .

If A, B and C are interior angles of a DeltaABC , then show that cot((B+C)/(2))=tan((A)/(2)) .

In any triangle ABC, show that : 2a cos (B/2) cos (C/2) = (a+b+c) sin (A/2)

If A ,\ B ,\ C are the interior angles of a triangle A B C , prove that tan(B+C)/2=cotA/2

In any triangle ABC, show that : 2a sin (B/2) sin (C/2)=(b+c-a) sin (A/2)

If A ,\ B ,\ C are the interior angles of a triangle A B C , prove that tan((C+A)/2)=cotB/2 (ii) sin((B+C)/2)=cosA/2

For any triangle ABC, prove that (b+c)cos((B+C)/2)=acos((B-C)/2)

For triangle ABC, show that "sin"(A+B)/2="cos"C/2

For triangle ABC, show that "tan"(B+C)/2="cot"A/2