1.

int 3^(x)cos 5x dx =

Answer»

`(3^(x))/((log 3)^(2) + 25) `[ (log 3) .cos 5 x - 5 SIN 5 x ] + c
`(3^(x))/((log 3)^(2) + 25) `[ (log 3) .cos 5 x+ 5 sin 5 x ] + c
`(3^(x))/((log 3)^(2) + 25) `[ 5 cos 5x -(log 3).sin 5 x ] + c
`(3^(x))/((log 3)^(2) + 25) `[5COS 5x + (log 3).SIN5X] + c

Answer :B


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