In `triangle ABC,` prove that `\sin({B+C}/2)=\cos (A/2)`

For any triangle ABC, prove that sin(B-C)/2=(b-c) /a ( cosA/2)

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

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

In triangle ABC, prove that cos(A/2)+cos(B/2)+cos(C/2)=4cos(pi-A)/4cos(pi-B)/4cos(pi-C)/4

For triangle ABC prove that sec((A+B)/2)="cosec"C/2

For any triangle ABC, prove that (a-b)/c=(sin((A-B)/2))/(cos(C/2))

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

In triangle ABC, prove that sin""(A)/(2)sin""(B)/(2)sin""(C)/(2)le(1)/(8) and hence, prove that co sec ""(A)/(2)+co sec""(B)/(2)+co sec""(C)/(2)ge6 .

In triangle ABC, prove that (b/c+c/b) cosA +(a/b+b/a) cos C+(a/c+c/a)cosB=3

In a triangle ABC, prove that (b + c)/(a) le cosec.(A)/(2)