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`sec^(2)(7-4x)`

Answer» `intsec^(2)(7-4x)dx" माना "7-4x=t`
`=int sec^(2)t.(dt)/(-4)" "rArr -4dx=dt`
`" "rArr" "dx=(dt)/(-4)`
`=-(1)/(4)tant+c=-(1)/(4)tan(7-4x)+c`


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