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Thread: Trig Identity Help Plz

  1. #1
    I've been trying to do this problem but I am stuck and since your all so nice :) can someone help me prove this?

    If A,B, and C are the angles of any triagle show that

    sin A+ sin B + sin C= 4cosA/2 cos B/2 cos C/2


    Thank you for your help.

    This is what I have so far..
    - (a) sin C = sin(A + B).
    - (B) sin A + sin B + sin (A + B) = 2 sin ((A+B)/2) ( cos ((A-B)/2) + cos ((A+B)/2) ).

  2. Lounge   -   #2
    bujub22's Avatar THE GREAT
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    e=mc2

  3. Lounge   -   #3
    h1
    Guest
    Graph it and you'll get the answer.

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