math please help!

Find the derivative if f(x)= e^-3x times sin(4x) use the product rule.

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asked by Sarah
  1. d/dx [e^-(3x) ] [ sin (4 x) ]

    = [e^-(3x) ] d/dx [ sin (4 x) ]
    + [ sin (4 x) ] d/dx [e^-(3x) ]

    = [e^-(3x) ][4 cos (4x) ]
    + [ sin (4 x) ][ -3 e^-(3x) ]

    = e^-(3x)[ 4 cos (4x) -3 sin (4x) ]

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    posted by Damon

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