y=tan(x+y)

Prove that tan(x - y) + tan(y - z) + tan(z - x) = tan(x - y) *tan(y -z)* tan(z -x) .

If (cos x)^(y)=(tan y)^(x), prove that (dy)/(dx)=(log tan y+y tan x)/(log cos x-x sec y cos ecy)

(tan(x+y)-tan x)/(1+tan(x+y)tan x)=tan y

(tan(x+y)-tan x)/(1+tan(x+y)tan x)=tan y

Find the general solution of the differential equation : (dx)/(dy)=(y tan y- x tan y - xy)/( y tan y) .

If cos x=lambda cos(x-2y) then value of (1-lambda)/(1+lambda)= A) tan(x-y)cot y B) cot(x-y)tan y C) tan(x-y)tan y D) 0

Prove that : tan (x-y)+tan (y -z) + tan (z-x)= tan (x-y)tan (y -z) tan (z-x) .

Show that tan (x - y)+ tan (y - z) + tan (z- x) = tan (x - y) tan (y - z) tan (z- x)