1.

`int sin (a+b)cos(ax+b) dx`

Answer» `int sin (ax+b)cos (ax+b)dx`
माना `sin(ax+b)=t`
`rArr a cos (ax+b)dx=dt`
`rArr cos (ax+b)dx=(dt)/(a)`
`=intt(dt)/(a)=(1)/(a).(t^(2))/(2)+c`
`=(1)/(2a)sin^(2)(ax+b)+c`


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