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 2beta=

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

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

(sinalpha cos beta+cos alpha sin beta)^2+(cos alpha cos beta-sin alpha sin beta)^2=1

(cos alpha + cos beta) ^ (2) + (sin alpha + sin beta) ^ (2) =

The value of the determinant Delta = |(cos (alpha + beta),- sin (alpha + beta),cos 2 beta),(sin alpha,cos alpha,sin beta),(- cos alpha,sin alpha,- cos beta)| , is

If x cos alpha + y sin alpha = x cos beta + y sin beta = 2a then cos alpha cos beta =