Posted by **Hansika** on Tuesday, April 30, 2013 at 11:23am.

CosA+cosB-cosC=4COSA/2 cosB/2 SINC/2-1

## Answer this Question

## Related Questions

- math - If A + B + c = 180 then show that sinA + sinB + sinC=4cosA/2. cosB/2 . ...
- Trigonometry - Prove that 1-cosA+cosB-cos(A+B)/1+cosA-cosB-cos(A+B) = tanA/2cotA...
- maths - in triangle ABC,right-angled at A,if cot B=1, find the value of cosB ...
- trig - 1-cosA+cosB-cos(A+B)/1+cosA-cosB-cos(A+B)=tan(A/2)ct(A/2)
- trig - prove 1-cosB divided by 1+cosB= tan^2B/2
- further mathematics - Let P=(cosA sinA) (sinA cosA) Q=(cosB sinA) (sinB cosA) ...
- math - find all solutions in the interval [0,2 pi) sin(x+(3.14/3) + sin(x- 3.14/...
- mathematics - if sinA+sinB=x and cosA-cosB=y then find tan[(A-B)/2]
- Trigonometry - If sinA + sinB = a and cosA + cosB = b, find the value of tanA-B/...
- precal - Evaluate tan B tan C if triangle ABC is not a right trianlge and cos A=...

More Related Questions