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Math Help - More trig differentials

  1. #1
    Junior Member
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    Sep 2007
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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. #2
    Math Engineering Student
    Krizalid's Avatar
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    Santiago, Chile
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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. #3
    Junior Member
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    got it! thanks!
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