easy differentiation?

**djmccabie** · June 1st 2009, 04:11 AM

ok i Just came out of an exam an wondering if I differentiated part of a question right.

I know

$tan(x)$ differentiates to $sec^2x$

but would $tan(2x)$ differentiate to $2sec^22x$ or $2sec^24x$ ?

**Moo** · June 1st 2009, 04:12 AM

Hello,

Originally Posted by djmccabie

ok i Just came out of an exam an wondering if I differentiated part of a question right.

I know

$tan(x)$ differentiates to $sec^2x$

but would $tan(2x)$ differentiate to $2sec^22x$ or $2sec^24x$ ?