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Integrate the following functions: sin 4...

Integrate the following functions: sin 4x sin8x

Text Solution

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sin 4x sin 8x
`=1/2[cos(8x-4x)-cos(8x+4x)]`
=1/2[cos 4x- cos12x]
therefore` int sin4x sin 8x dx`
=`1/2[(sin 4x)/4-sin(12x)/(12)]+c`
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