1.

inte^(3x)cos4xdx=.........+c

Answer»

`(E^(3x))/(25)(3cos4x-4sin4x)`
`(e^(3x))/(5)(3cos4x-4sin4x)`
`(e^(3x))/(5)(3cos4x+4sin4x)`
`(e^(3x))/(5)cos(4x-tan^(-1)""(4)/(3))`

Answer :D


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