Posted by **JK** on Friday, August 13, 2010 at 12:29pm.

sinx+ siny/ (cosx+cosy)= tan 1/2 (x+y)

prove this identity

## Answer this Question

## Related Questions

- Math - Suppose f(x) = sin(pi*cosx) On any interval where the inverse function y...
- Math - Pre- Clac - Prove that each of these equations is an identity. A) (1 + ...
- trig - Okay, I've been getting some of these, but I can't seem to verify this ...
- math - 1. Prove the identity:cosx/1-tanx+sinx/1-cotx=sinx+cosx 2.Prove the ...
- Trigonometry - Prove the following trigonometric identities. please give a ...
- Trig........ - I need to prove that the following is true. Thanks (cosx / 1-sinx...
- maths (trigonometry) - please solve these if possible Q1. If sinx +siny=3(cosy-...
- Math - Verify the identity . (cscX-cotX)^2=1-cosX/1+cosX _______ sorry i cant ...
- Pre-calc - prove the identity: (cosx)(tanx + sinx cotx)=sinx+cos(squared)x i ...
- Pre-Calc - Trigonometric Identities Prove: (tanx + secx -1)/(tanx - secx + 1)= ...