Posted by **mtd** on Wednesday, April 9, 2008 at 2:06pm.

sorry, another I can't figure out

Show that (1-cot^2x)/(tan^2x-1)=cot^2x

I started by factoring both as difference of squares. Would I be better served by writing in terms of sine and cosine? Such as:

[1-(cos^2x/sin^2x)]/[(sin^2x/cos^2x)-1]=(cos^2x/sin^2x)

- Math (Trig) -
**Reiny**, Wednesday, April 9, 2008 at 2:36pm
I don't think your equation is an identity,

I tried several angles and the Left Side is not equal to the Right Side.

Check your typing.

In general, I try to prove these type of identities by changing everything to sines and cosines, unless I can recognize one of the common trig relationships.

## Answer This Question

## Related Questions

- sine and cosine - Simplify and write the trigonometric expression in terms of ...
- Math (Trig) - I have a unit circle graph like the one at the top of a website (...
- math (trig) - Prove: sin^2(x/2) = csc^2x - cot^2x / 2csc^2(x) + 2csc(x)cot(x) On...
- Math - Trig - I'm trying to verify these trigonometric identities. 1. 1 / [sec(x...
- math - write each expression in terms of sine and cosine: csc^3 theta/cot theta...
- trig - Simplify and write the trigonometric expression in terms of sine and ...
- Trig verifying identities - I am having trouble with this problem. sec^2(pi/2-x...
- Trigonometry - express in terms of sine and cosine. a) tan theta/ cot theta i ...
- math - how do I simplify these? 1. (Cot/1-tan) + (Tan/1-Cot) - Tan - Cot 2. (1+...
- math - Simplify and write the trigonometric expression in terms of sine and ...

More Related Questions