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Thread: write tan10x in terms of tan5x (?!)

  1. April 13th 2008, 06:28 PM #1
    blair_alane
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    write tan10x in terms of tan5x (?!)

    We are supposed to:

    "write tan10x in terms of tan5x."

    I'm stumped! I don't remember learning this!

    Please help me!
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  2. April 13th 2008, 07:30 PM #2
    o_O
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    Do you know the double angle formula for \tan (2\theta ):

    \tan (2\theta) = \frac{2 \tan \theta}{1 - \tan^{2} \theta}

    Here, imagine \theta = 5x
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