# Math Help - Help with Trigonometric Identiy

1. ## Help with Trigonometric Identiy

Hey can I get some help with this .

If: A = 1+sin(x) / cos (x) then prove 1/A = 1-sin(x) / cos (x).

Thanks !

2. ## Re: Help with Trigonometric Identiy

You didn't think to invert both fractions?

3. ## Re: Help with Trigonometric Identiy

Wouldn't an inversion of A give cos (x) / 1 + sin (x) which =/= 1-sin(x) / cos(x)

4. ## Re: Help with Trigonometric Identiy

That's just the first step. Now try multiplying top and bottom by the bottom's conjugate.

5. ## Re: Help with Trigonometric Identiy

Ahhhhhhh. Thanks very much, I understand the concept now!