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Math Help - Indefinite integral

  1. #1
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    Indefinite integral

    integral 3sin4xdx=?
    Thanks.
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by nystudent2729 View Post
    integral 3sin4xdx=?
    Thanks.
    lets take this slow.

    \int 3 \sin 4x~dx

    Let u = 4x

    \Rightarrow du = 4~dx

    \Rightarrow \frac 14 ~du = dx

    So our integral becomes

    \frac 14 \int 3 \sin u~du = \frac 34 \int \sin u~du

    can you finish? do you remember what the integral of sine is?
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