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    trigno's Avatar
    trigno Posts: 2, Reputation: 1
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    #1

    Nov 26, 2008, 08:06 PM
    deriving trig formula
    derive the half angle formula for sine, sin (X/2) = squaroot((1-cosx)/2) from a double angle formula for cosine.
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    Nov 26, 2008, 08:29 PM






    Now, use the substitution
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