If `tan^(2) A= 2 tan ^(2) B+1, "then " cos 2A + sin^(2)B = `

If tan A = 1//2 , tan B=1//3 " then " cos 2A=

If tan A=1//2, tan B=1//3 , then prove that cos 2A=sin2B .

If tan A=1//2, tan B=1//3 , then prove that cos 2A=sin2B .

If tan A=1//2, tan B=1//3 , then prove that cos 2A=sin2B .

If tan A =1/2, tan B=1/3, then cos 2A= ........... A) sin B B) sin 2B C) sin 3B D) -sin 2B

2cos^(2)B-1=tan^(2)A, then cos A cos B

If tan A =1/2, tan B=1/3, then cos 2A=

Prove the following identities : tan^(2) A - tan^(2) B = (sin^(2) A - sin^(2) B)/ (cos^(2) A . cos^(2) B)

If tan (A+B) = 3 tan A , "show that" sin (2A +2B) + sin 2A = 2 sin 2 B

If 2 Cos^(2)B - 1 = Tan^(2) A then Cos A Cos B =