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If y=4cos4x find int y dx...

If `y=4cos4x` find `int y dx`

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The correct Answer is:
C, D
`y=4cos4x`
`intydx=int4cost(dt)/(4)`
`4x=t`
`4dx=dt`
`dx=(dt)/(4)`
`int4cost(dt)/(4)=sint=sin4x`
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