f(x)=x³+3x+6
i need to find f^-1'(2)
do i need to find the inverse of f(x) before i derive it. or do i derive it first, then find the inverse, and then plug 2 in for x?
I suppose you already know that , when the derivative in the denominator is expressed in the same variable as the one of , of course.
So in this case , when x is expressed as function of y, and we don't have the faintest idea what is this...but we don't need to have: just check that as , then
Tonio