If `tanA=5/6,tanB=1/11` prove that `A+B=pi/4`

Prove the following:If tanA=1/2,tanB=1/3 ,prove that cos2A=sin2B

If tanA=1/2 , tanB=1/3 , then cos2A=

If A+B+C=pi , prove that cos 2A +cos 2B +cos 2C=-1-4cos A cos Bcos C.

Select the correct options from the given alternatives.If tanA-tanB=x and cotB-cotA=y then cot(A-B)= ……….

If tan A=(a)/(a+1) and tan B=(1)/(2a+1) then find the value of A+B=................. A) 0 B) pi/2 C) pi/3 D) pi/4

Prove the following:If tanA=2tanB+cotB ,then 2tan(A-B)=cotB

If sinA/3=sinB/4=1/5 and A,B are angles in the second quadrant then prove that 4cosA+3cosB=-5

If tan^(-1)((a+x)/(a) )+ tan ^(-1) ((a-x)/(a)) = (pi)/(6) then prove that x^(2) = 2sqrt(3)a^2

IF tanA+cotA=5, then tan^4 A+cot^4 A is equal