I'm confused....is the same thing as ? I was told you rewrite these as , respectively.

Now I have a problem and I'm unsure how to do it since I don't know the above rule:

Find the derivative of f(Θ) = secΘ^2

How would you rewrite this and how would you proceed?

If I treat it as (secΘ)^2 I get: 2secΘ^2(tanΘ)

Thanks=]