If `sin alpha = sin beta and cos alpha = cos beta ` then

If sin alpha + sin beta =p , cos alpha + cos beta = q then find the value of cos 2alpha + cos 2beta in terms of p and q.

If sin alpha + sin beta = p "and" cos alpha + cos beta = q "then the value of " "tan" (alpha-beta)/2 will be-

If sin alpha + sin beta = a and cos alpha + cos beta = b, prove that : cos (alpha-beta) = 1/2 (a^2 + b^2 -2)

If sin alpha + sin beta = a , cos alpha + cos beta = b " then sin ( alpha + beta ) =

If sin alpha + sin beta = a , cos alpha + cos beta = b " then cos ( alpha + beta ) =

If sin alpha + sin beta = 0 = cos alpha + cos beta . Where 0 lt beta lt alpha lt 2 pi , then which one of the following is correct?

If sin alpha+sin beta=a and cos alpha-cos beta=b then

If sin alpha-sin beta=a and cos alpha+cos beta=b then write the value of cos(alpha+beta)

If sin alpha-sin beta=a and cos alpha+cos beta=b then write the value of cos(alpha+beta)