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Thread: Simplify the Expression (Double-Angle or Half-Angle)

  1. November 3rd 2009, 01:10 PM #1
    l flipboi l
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    Simplify the Expression (Double-Angle or Half-Angle)

    Hello,

    Can someone please help me with simplifying this problem?

    1) 2tan7 / 1-tan7
    2) sqrt(1-cos30 /2)
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  2. November 3rd 2009, 03:38 PM #2
    skeeter
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    Quote Originally Posted by l flipboi l View Post
    Hello,

    Can someone please help me with simplifying this problem?

    1) 2tan7 / 1-tan7

    2) sqrt(1-cos30 /2)
    (1) double angle should be \frac{2\tan(7)}{1 - \tan^2(7)} = \tan(14)<br />

    (2) \sqrt{\frac{1-\cos(30)}{2}} = \sin(15)
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