Math

posted by .

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

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. math

    find all solutions in the interval [0,2 pi) sin(x+(3.14/3) + sin(x- 3.14/3) =1 sin^4 x cos^2 x Since sin (a+b) = sina cosb + cosb sina and sin (a-b) = sina cosb - cosb sina, the first problem can be written 2 sin x cos (pi/3)= sin …
  2. trig

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

    1-cosA+cosB-cos(A+B)/1+cosA-cosB-cos(A+B)=tan(A/2)ct(A/2)
  4. Trigonometry

    Prove that 1-cosA+cosB-cos(A+B)/1+cosA-cosB-cos(A+B) = tanA/2cotA/2
  5. maths

    in triangle ABC,right-angled at A,if cot B=1, find the value of cosB cosA+sinB sinC
  6. further mathematics

    Let P=(cosA sinA) (sinA cosA) Q=(cosB sinA) (sinB cosA) show that PQ=(cosA(A-B) sin(A B)) (sinA(A B) cos(A-B))
  7. math

    If A + B + c = 180 then show that sinA + sinB + sinC=4cosA/2. cosB/2 . cosC/2
  8. Math

    If 1/sinA+1/cosA =1/sinB+1/cosB, prove that: cot(A/2+B/2) = TanA. TanB
  9. Maths

    Prove that CosB-cosA/cosA+cosB=tanA+B/2tanA-B/2
  10. Math

    If sinA+sinB=1/2 and cosA+cosB=1/2 then the value of tanA+tanB

More Similar Questions