4yxy+y^(2)=tan x+y

What is the value of {(sin 4x+ sin4y} [(tan 2x- 2y)]}//(sin 4x -sin4y) ? {(sin 4x+ sin4y} [(tan 2x- 2y)]}//(sin 4x -sin4y) का मान क्या है?

Prove that ,,(sin(x+y))/(sin(x-y))=(tan x+tan y)/(tan x-tan y)

Prove that: (sin(x+y))/(sin(x-y))=(tan x+tan y)/(tan x-tan y)

If tan^(2)z= tan (x+y) tan (x-y) , show that cot^(2)y+ cot (z+x) cot (z-x)=0

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

If y = tan ^(-1) (sec x + tan x) , " find " (d^(2) y)/( dx^(2)) at x = (pi)/(4)

sec^(2) y tan x dy + sec^(2) x tan y dx = 0 , " when " x =y = pi/4

"If "e^(sin(x^(2)+y^(2)))=tan""(y^(2))/(4)+sin^(-1)x," then y'(0) can be "

Prove that (sin (x +y) )/( sin (x-y)) = (tan x + tan y)/( tan x - tan y).