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Thread: More trig differentials

  1. October 14th 2007, 07:04 PM #1
    pseizure2000
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    More trig differentials

    Yeah I missed this lesson in class because my alarm never went off. So i have plenty of question por vous.

    f(x) = cos^9(x^4)

    not a clue
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  2. October 14th 2007, 07:07 PM #2
    Krizalid
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    Chain Rule rules here!

    f'(x)=9\cos^8(x^4)\cdot(\cos x^4)'

    Can you take it from there?
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  3. October 14th 2007, 07:16 PM #3
    pseizure2000
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    got it! thanks!
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