If `sinbeta` is the G. M. between `sin alpha and cos alpha,` then `cos 2beta = ?`

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

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 2beta=

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

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

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 alpha=sinbeta and cos alpha=cosbeta, then

sin alpha=sinbeta, cos alpha=cos beta then

(cos alpha + cos beta)/( sin alpha - sin beta) + (sin alpha + sin beta)/( cos alpha - cos beta ) =