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    Laurenh11's Avatar
    Laurenh11 Posts: 1, Reputation: 1
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    #1

    Mar 28, 2012, 06:54 PM
    Trig functions: sin(x+pi) = -sin(x)
    Sin(x + pi)=-sinx
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Mar 29, 2012, 06:16 AM
    You can show this by applying the identity sin(a+b) = sin(a)cos(b)+cos(a)sin(b).
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