1.

int e^(-4x) cos x dxis

Answer»

`(e^(-4X))/17 [ 4 cos X + sin x] + c`
`(e^(-4x))/(17) [ - 4 con x + sin x] + c `
`(e^(-4x))/17 [ -4COS x + sin x]+ c `
`(e^(-4x))/17 [ - 4 cos x- sin x] + c `

ANSWER :D


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