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

    Mar 11, 2013, 11:27 PM
    Establish this identity
    sin(alpha-beta)cos(beta)+cos(alpha-beta)sin(beta)=sin(alpha)
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    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Mar 12, 2013, 05:51 AM
    Do you know the formulas for sin(a-b) and cos(a-b)? Apply them, multiply the resulting expressions out and group like terms. And remember that sin^2b = cos^2b = 1.
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