Consider the function f(x,y)=x^2+y^2 where x=sin2θ and y=cos2θ

df/dθ is given by?

Hello

Will someone be kind enough to provide me with the complete answer and explanation(Headbang) please?

I have studied stuff like this in 8 years.I've running around this for the past three days.

I have looked at the chain rule for multivariate functions.

The Trig identity Sin^2+Cos^2=1

I seem to be moving in circles