# Simple Derivative...Mental Lapse

• November 26th 2007, 06:57 PM
Super Mallow
Simple Derivative...Mental Lapse
I just totally had a mental lapse here...

What's the derivative of TanSquaredX?
• November 26th 2007, 07:01 PM
Soroban
Hello, Super Mallow!

Quote:

What's the derivative of: . $f(x) \:=\:\tan^2\!x$ ?

Think of it as: . $f(x) \;=\;[\tan x]^2$ .and use the Chain Rule.

• November 26th 2007, 07:03 PM
Super Mallow
Yup, I know that. This is actually really simple for me, but for some reason, I'm having a mental lapse on trig functions to a power right now!

Is it 2(Times)sec2x?
• November 26th 2007, 07:12 PM
Jhevon
Quote:

Originally Posted by Super Mallow
Yup, I know that. This is actually really simple for me, but for some reason, I'm having a mental lapse on trig functions to a power right now!

Is it 2(Times)sec2x?

no. the chain rule says $\frac d{dx}f(g(x)) = f'(g(x)) \cdot g'(x)$

you're missing something