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

If sin beta is the G.M between sin alpha and cos alpha , then cos 2 beta is

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

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

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 GM.between sin alpha and cos alpha then (cos alpha-sin alpha)^(2)-2cos^(2)beta=1)02:)13 24)-1

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

If 0 le alpha beta le 90^@ such that cos (alpha - beta) = 1 , then what is sin alpha - sin beta + cos alpha - cos beta equal to ?

If cos alpha + cos beta =0 = sin alpha + sin beta , then cos 2 alpha + cos 2 beta is equal to

If cos alpha+cos beta=0=sin alpha+sin beta , then cos 2 alpha+cos 2beta is equal to