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    Squier93 Posts: 1, Reputation: 1
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    #1

    Oct 2, 2012, 03:13 PM
    ((sin(x)+sin(3x))/(2sin(2x)))=cos(x)
    ((sin(x)+sin(3x))/(2sin(2x)))=cos(x)
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    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Oct 3, 2012, 08:13 AM
    Hint: to get started use the identity sin(a+b)=sin(a)cos(b)-sin(b)cos(a), where a = x and b = 2x. Then the idenity cos(2x) = 2cos^2x-1 and sin(2x)=2sin(x)cos(x). The rest is just manipulation.
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