# Math Help - How to differentiate a trig function

1. ## How to differentiate a trig function

This problem is giving me, well...problems:

2x^2 tan(x)
-------------- = f(x)
sec (x)

not sure how im supposed to differentiate this at all.

2. Originally Posted by pseizure2000
2x^2 tan(x)
-------------- = f(x)
sec (x)
$\frac{\tan x}{\sec x}=\sin x,$ therefore it remains to differentiate $f(x)=2x^2\sin x$

Does that make sense?

3. Originally Posted by pseizure2000
This problem is giving me, well...problems:

2x^2 tan(x)
-------------- = f(x)
sec (x)

not sure how im supposed to differentiate this at all.
$\frac{\tan x}{\sec x} = \frac{\sin x / \cos x}{1/\cos x} = \sin x$.

Thus we have,
$2x^2\sin x$.
Which is simpler.

This is Mine 73th Post!!!

4. thanks didn't catch that at all!