How do i integrate cos4xcosx ? i used cos4x=2cos(^2)2x - 1 i dont know how to proceed.
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Originally Posted by kandyfloss 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
Can you please show?
Originally Posted by kandyfloss Can you please show? Please show your attempt at using the formulae given in post #2.
Yeah i got : 1/2 (integral) cos3x + cos5x using the formula [took the 1/2 out]
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