If `sin beta` is the geometric mean between `sin alpha` and `cos alpha` then `cos 2 beta=`

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

If sin2 beta is the geometric mean between sin alpha and cos alpha, then cos4 beta is equal to

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 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 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 sin beta is the GM between sin alpha and cos alpha then (cos alpha-sin alpha)^(2)-2(cos beta)^(2)=

If sin beta is the G.M between sin alpha and cos alpha then (cos alpha - sin alpha)^(2) - 2 cos^(2) beta =

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