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Math Help - Integration

  1. #1
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    Integration

    How do i integrate cos4xcosx ?
    i used cos4x=2cos(^2)2x - 1
    i dont know how to proceed.
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  2. #2
    Behold, the power of SARDINES!
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    Quote Originally Posted by kandyfloss View Post
    How do i integrate cos4xcosx ?
    i used cos4x=2cos(^2)2x - 1
    i dont know how to proceed.
    Use the product to sum identitety

    List of trigonometric identities - Wikipedia, the free encyclopedia
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  3. #3
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    Can you please show?
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  4. #4
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    Quote Originally Posted by kandyfloss View Post
    Can you please show?
    Please show your attempt at using the formulae given in post #2.
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  5. #5
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    Yeah i got : 1/2 (integral) cos3x + cos5x using the formula [took the 1/2 out]
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