# Calculus : Derivative

posted by
**Akash**
.

If tan^-1(x^2-y^2/x^2+y^2) = a, prove that dy/dx = x(1 - tan a)/y(1 + tan a)

Please solve!!!

posted by
**Akash**
.

If tan^-1(x^2-y^2/x^2+y^2) = a, prove that dy/dx = x(1 - tan a)/y(1 + tan a)

Please solve!!!