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Math Help - more trig

  1. #1
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    more trig

    prove each identity so L.S. = R.S.

    1) sin x (divided by) 2 = 1-cosx(divided by)2 (right side of equation is all under square root sign)
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  2. #2
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    have you tried using the trig identity, (cosx)^2 + (sinx)^2 = 1?

    also is that (1-cosx)/2 or 1-cosx/2?
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  3. #3
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    i dont think that identity applys to this one does it?

    it is just the square root of 1-cos(theta) all over 2 = sin (theta) over 2

    sin(theta) = 1-cos(theta) <- right side is all under a square root sign
    2 2

    hope that helps

    thanks
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  4. #4
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    yea i thats what i mean both sides are equal
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