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    fionasdad Posts: 1, Reputation: 1
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    #1

    Nov 20, 2012, 01:16 PM
    proving trig identities solver
    sin(4x)=(4sin(x)cos(x))(1-2sin^2x) prove the identity
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    9015933 Posts: 3, Reputation: 1
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    #2

    Nov 20, 2012, 01:48 PM
    (1-2sin^2x)=cos(2x)
    2sin(x)cos(x)=sin(2x)
    ===> (4sin(x)cos(x))(1-2sin^2x)=sin(4x)
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