If `cot^2Acot^2B=3,` then the value of `(2-cos2A)(2-cos2B)` is ____

Find the value of (cos2B-cos 2A)/(sin2A+sin2B) :

If cot A.cot B=2, then what is the value of cos(A+B)*sec(A-B)?

If ABCD is a cyclic quadrilateral, then the value of cos^(2)A-cos^(2)B-cos^(2)C+cos^(2)D is ______.

If cos A=m cos B, then write the value of (cot(A+B))/(2)(cos(A-B))/(2)

If sin A+sin B=p,cos A+cos B=q Find the value of cos2A+cos2B

The maximum value of cos^(2)A+cos^(2)B-cos^(2)C, is

In triangle ABC,/_C=(2 pi)/(3) then the value of cos^(2)A+cos^(2)B-cos A*cos B is equal

ln Delta ABC,b^(2)cos2A-a^(2)cos2B=

If cos x+cos y=a and cos2x+cos2y=b then the value of cos x cos y=(lambda a^(2)+mu b-2)/(4) the value of 2 lambda-mu is