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Integration of cos 5x

Updated: 4/28/2022
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The integral of cos 5x is 1/5 sin (5x)

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Q: Integration of cos 5x
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There is some kind of formula here, half angle, or some such that I forget, but I do remember the algorithm. So...,int[cos(10X)cos(15X)] dxsince this is multiplicative, switch it aroundint[cos(15X)cos(10X)] dxint[cos(15X - 10X)/2(15 -10) + cos(15X + 10X)/2(15 + 10)] dxint[cos(5X)/10 + cos(25X)/50] dx= 1/10sin(5X) + 1/50sin(25X) + C=========================


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What is the integral of sin 5X cos 10X dX?

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