If `sin alpha+ sin beta =2` then find the value of `cos^2alpha+cos^2 beta`

If sin alpha + sin beta =2 , then find the value of cos^(2)alpha+cos^(2)beta .

If cos alpha + cos beta = 0 = sin alpha + sin beta, then value of cos 2 alpha + cos 2 beta is

If sin alpha cos beta=-(1)/(2) then find the range of values of cos alpha sin beta

If sin alpha cos beta=-(1)/(2) then find the range of values of cos alpha sin beta

If sin alpha cos beta=-(1)/(2) then find the range of values of cos alpha sin(beta

If alpha , beta are complementry angles such that bsin alpha = a , the find the value of (sin alpha cos beta - cos alpha sin beta) .

Let alpha, beta" such that "pi lt alpha-beta lt 3pi." If sin "alpha+sin beta=-21//65 cos alpha+cos beta=-27//65 , then find the value of cos ""(alpha-beta)/(2) .

if alpha and beta satisfy sin alpha cos beta=-(1)/(2), then the greatest value of 2cos alpha sin beta is

If alpha+beta=90^(@),alpha=2beta , then find the value of cos^(2)alpha+sin^(2)beta .

Ifsin^(4)alpha+cos^(4)beta+2=4sin alpha cos beta,0<=alpha,beta<=(pi)/(2) then find the value of (sin alpha+cos beta)