If cos A + cos B = 2, then which of the following is the value of cos (A + B)?`

Let cosA+cosB=x,cos2A+cos2B=y,cos3A+cos3B=z ,then which of the following is true

If A+B=(pi)/(3) and cos A+cos B=1 then which of the following is/are true?

If cos A=m cos B, then write the value of (cot(A+B))/(2)(cos(A-B))/(2)

If A+B=(pi)/(3) and cos A+cos B=1, then find the value of (cos(A-B))/(2)

Consider a triangle ABC in which cos A + cos B + cos C = sqrt(3) "sin"(pi)/(3) What is the value of cos((A+B)/(2))cos((B+C)/(2))cos((C+A)/(2)) ?

If sin A=sin B and cos A=cos B, then find the value of A in terms of B.

If sin A = sin B, cos A = cos B, then the value of A in terms of B is