Posted by **Sarah** on Wednesday, May 26, 2010 at 9:36pm.

prove 1-cosB divided by 1+cosB= tan^2B/2

## Answer this Question

## Related Questions

- trig - 1-cosA+cosB-cos(A+B)/1+cosA-cosB-cos(A+B)=tan(A/2)ct(A/2)
- Math - CosA+cosB-cosC=4COSA/2 cosB/2 SINC/2-1
- Trigonometry - Prove that 1-cosA+cosB-cos(A+B)/1+cosA-cosB-cos(A+B) = tanA/2cotA...
- math - find all solutions in the interval [0,2 pi) sin(x+(3.14/3) + sin(x- 3.14/...
- precal - Evaluate tan B tan C if triangle ABC is not a right trianlge and cos A=...
- mathematics - if sinA+sinB=x and cosA-cosB=y then find tan[(A-B)/2]
- trig - A and B are acute angles such that cosA =3 over 5 and cosB =12 over 13
- pre calculus - sinB + cosB cotB = cscB
- Math - If a and B are two angles in Quadrant 2 such that tan a=-1/2 and tan B= -...
- precalculus - Given sina= 3/4 and cosB = (-5)/13 and this is Quad II find cos(a...