" If "cos^(-1)x-cos^(-1)((y)/(2))=alpha" then "4x^(2)-4xy cos alpha+y^(2)=

If cos^(-1) x - cos ^(-1) (y)/(2) =alpha then 4x^(2) -4xy cos alpha+ y^(3) is equzal to

If Cos^(-1)x-Cos^(-1)(y/2)=alpha" then "4x^(2)-4xycosalpha+y^(2)=

If cot^(-1)x-"cos"^(-1)(y)/(2)=alpha , then 4x^(2)-4xy cos alpha+y^(2) is equal to :

If cos^(- 1)x-cos^(- 1)(y/2)=alpha then 4x^2-4xycosalpha+y^2=

If cos^(- 1)x-cos^(- 1)(y/2)=alpha then 4x^2-4xycosalpha+y^2=

If cos^(-1)x-"cos"^(-1)y/2=alpha , then 4x^(2)-4xycos alpha+y^(2) is equal to

If cos^(-1)x- cos^(-1)""(y)/2 = alpha , then 4x^2 -4xycos alpha +y^2 is equal a) 2 sin alpha b)4 c) 4 sin^2alpha d) -4 sin^2alpha

If cos^(-1)x-cos^(-1)y=alpha, then x^(2)+y^(2)-2xy cos alpha is equal to

If cos^(-1)x-cos^(-1)(y/2)=alpha,t h e n4x^2-4x ycosalpha+y^2 is equal to 4 (b) 2sin^2alpha (c) -4sin^2alpha (d) 4sin^2alpha

If cos^(-1)((x)/(2))+cos^(-1)((y)/(3))=alpha then prove that 9x^(2)-12xy cos alpha+4y^(2)=36sin^(2)alpha