# Thread: make a rational expression out of: sec x tan x....

1. ## make a rational expression out of: sec x tan x....

Make on one rational expression out of:

Sec x Tan x -root2 sec^2x

I'm having a little trouble getting started on this on. Sorry if I wrote it out in a funny way.

2. ## Re: make a rational expression out of: sec x tan x....

Originally Posted by StudentMCCS
Make on one rational expression out of:

Sec x Tan x -root2 sec^2x

I'm having a little trouble getting started on this on. Sorry if I wrote it out in a funny way.
I don't know what you mean by wanting a rational expression... It will never be rational since $\displaystyle \displaystyle \sqrt{2}$ is irrational...

3. ## Re: make a rational expression out of: sec x tan x....

The problem is number 4 of the attached problem sheet. This is my first assignment for calculous 1.

4. ## Re: make a rational expression out of: sec x tan x....

It probably means to write it as a fraction (i.e. a rational function) in terms of $\displaystyle \displaystyle \sin{x}$ and $\displaystyle \displaystyle \cos{x}$...

5. ## Re: make a rational expression out of: sec x tan x....

Write cos(x) and tan(x) in terms of sin(x) & cos(x). Write the result as a single fraction.