Posted by **George** on Tuesday, November 13, 2012 at 9:43am.

Prove or disprove the following identity.

cos(-x) - sin(-x) = cos(x) + sin(x)

## Answer this Question

## Related Questions

- Math - Calculus - The identity below is significant because it relates 3 ...
- Mathematics - Trigonometric Identities - Let y represent theta Prove: 1 + 1/tan^...
- tigonometry - expres the following as sums and differences of sines or cosines ...
- Precalculus with Trigonometry - Prove or disprove the following identity: (sin(...
- TRIG! - Posted by hayden on Monday, February 23, 2009 at 4:05pm. sin^6 x + cos^6...
- Precalculus with Trigonometry - Prove or disprove the following Identities: cos...
- trig - Reduce the following to the sine or cosine of one angle: (i) sin145*cos75...
- algebra - Can someone please help me do this problem? That would be great! ...
- precalculus - For each of the following determine whether or not it is an ...
- Trigonometry - Prove the identity sin(x+y+z)+sin(x+y-z)+sin(x-y+z)+ sin(x-y-z...