1.

`(3x+5)(1+tanx)`

Answer» Let `y=(3x+5)(1+tanx)`
`(dy)/(dx) = d/(dx)[(3x+5)(1+tanx)]`
`=(3x+5)(sec^(2)x)+(1+tanx).3`
`=(3x+5)sec^(2)x+3(1+tanx)`
`=3xsec^(2)x+5sec^(2)x+3tanx+3`


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