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intcos^(3)x" " dx=...

`intcos^(3)x" " dx=`

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`intcos^(3)xdx=(1)/(4)int(3cosx+cos3x)dx`
`=(3)/(4)intcosxdx+(1)/(4)intcos3xdx`
`=(3)/(4)sinx+(1)/(12)sin3x+c`
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