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C3 derivatives of trig functions

Hi,

I've got some questions and I'm not sure what to do.

An example of one is:

'By writing y=secx as y=

(cosx)^{-1}

use the chain rule to establish the result

\frac{d(secx)}{dx} = secxtanx

So after I've done the first bit, to get

(cosx)^{-1} \rightarrow \frac{d(secx)}{dx} sinx(cosx)^{-2}

I'm not sure how to move on. I've got a number of questions that follow a similar pattern so hopefully if I can get a few tips with this one it will help me with the rest!

Thanks :rolleyes:

Reply 1

LightBlueSoldier

Original post by marcsaccount

Hi,

I've got some questions and I'm not sure what to do.

An example of one is:

'By writing y=secx as y=

(cosx)^{-1}

use the chain rule to establish the result

\frac{d(secx)}{dx} = secxtanx

So after I've done the first bit, to get

(cosx)^{-1} \rightarrow \frac{d(secx)}{dx} sinx(cosx)^{-2}

I'm not sure how to move on. I've got a number of questions that follow a similar pattern so hopefully if I can get a few tips with this one it will help me with the rest!

Thanks :rolleyes:

That's correct....

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