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    airco100's Avatar
    airco100 Posts: 1, Reputation: 1
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    #1

    May 18, 2011, 07:43 AM
    Sum or difference identities
    Tan15 degree
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    May 18, 2011, 07:51 AM

    You can determine the value of tan(15 degrees) by applying the difference formulas for sine and cosine:



    Can you take it from here?
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