If `sin 2 beta` is the geometric mean between `sin alpha and cos alpha,` then `cos 4 beta` is equal to

If sin beta is the geometric mean between sin alpha and cos alpha then cos2 beta=

If sin beta is geometric mean between sin alpha and cos alpha, then cos2 beta=

If sinbeta is geometric mean between sin alpha and cos alpha , then cos 2beta =

If sin beta is the GM between sin alpha and cos alpha , then cos 2beta is equal to

If cos beta is the geometric mean between sin alpha and cos alpha , where 0ltalpha,betaltpi//2 . Then cos 2beta is equal to

Let cos beta is the geometric mean between sin alpha and cos alpha , where 0 lt alpha lt beta lt pi//2 , then cos 2beta is equal to

If cos beta is the geometric mean of sin alpha and cos alpha, then show that cos 2 beta= -2 cos^(2) ((pi)/(4)+alpha)

If cos alpha + cos beta = a, sin alpha + sin beta = b and theta is the arithmetic mean between alpha and beta then sin 2 theta + cos 2 theta is equal to

The expression (sin alpha+ sin beta)/(cos alpha+cos beta) is equal to: