In `triangleABC` , `cos((B+C)/2)`

In triangleABC, cos((A-B)/(2))=

In triangleABC, sin((B-C)/(2))=

In triangleABC if acos^2(C/2)+c cos^2(A/2)=3b/2 then show that a,b,c are in A.P

In a triangleABC, 2ac.sin((A-B+C)/2)=

In triangleABC,sin((B+C)/2) =

If in a triangleABC , cos (A-C) cos B + cos 2 B =0 , then which of the following options is(are) correct? (where, the symbols have their usual meanings).

If in a triangleABC , cos (A-C) cos B + cos 2 B =0 , then which of the following options is(are) correct? (where, the symbols have their usual meanings).

In a triangleABC, (cos C+cos A)/(c+a)+(cos B)/(b)=

In triangleABC , if cos 'A/2' = sqrt((b+c)/(2c)) , then-