How do i calculate $\lim_{h\to0}\frac{f(a+h^2)-f(a+h)}{h}$? All do i know about this problem is that f can be derived in "a".
What troubles me is the h squared,i just can't get rid of it or make it useful,no matter what i do, i always end up with it giving me an undefined limit, so it stays like that,any idea on how to get rid of it? or any rule i can use to make this easy?

You can write
$$\frac{f(a + h^2) - f(a+h)}{h} = h \cdot \frac{f(a+h^2) - f(a)}{h^2} - \frac{f(a+h) - f(a)}{h}$$
and compute these two limits individually.
