Well, since it's a fraction you could consider the quotient rule, but my advice is to rewrite it as and then just apply the exponent/power rule together with the chain rule. Give it a shot
Hi all. I am getting into the chain rule in my Calculus with Matrices business course. I've come across a problem, our system is all online, and i cannt figure it out. They examples they provided were pretty simple and staight forward, but i cannot put htis one together. I'm sure its really easy, but i'd appreciate it if someone would explain
then f '(x) is what? The system tell me the answer is
I cannot figure out even where to start on this problem nor which derivative rule to use. I'm probably overcomplicating it, but if any one would be willing to help i'd greatly appreciate it!
The chain rule is intended to facilitate differentiation of composite functions. In general, if f(g(x)) is the composition of function f with function g, then f '(x) = f '(g) * g '(x). For instance, consider y = e^sin(x). Here y=e^x is composed with u=sin(x). To simplify the thinking, we can write y = e^sin(x) as y = e^u where u=sin(x). So, dy/dx = dy/du * du/dx. Recalling the derivatives of e^x and sin(x) as e^x and cos(x) respectively, it follows that:
dy/dx = dy/du * du/dx = e^u * cos(x) = e^sin(x) * cos(x)
In the case at hand, f(x) = (x^2+1)^-1 can be inturpreted as u^-1 where
u = x^2+1. Hence f '(x) = -1* u^-2 * du/dx = -[x^2+1]^-2 * 2x or,
f '(x) = -2x / [x^2+1]^2.