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Thread: Integtration using u substitution help please

  1. #1
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    Integtration using u substitution help please

    Hi all i am trying to integrate the following but can't see the wood for the trees..
    [Cos(x/2)-sin(3x/2)]dx

    So far i have u=(x/2) and du=1/2. This is where i am starting to lose my mind as i cannot seem to make this fit the standard integrals. Any help would be greatly appreciated
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    Re: Integtration using u substitution help please

    Quote Originally Posted by tommorgan View Post
    Hi all i am trying to integrate the following but can't see the wood for the trees..
    [Cos(x/2)-sin(3x/2)]dx
    $\int {(\cos (\theta ) - \sin (3\theta ))d\theta = \sin (\theta ) + \frac{1}{3}\cos (3\theta )}$
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  3. #3
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    Re: Integtration using u substitution help please

    You can do each term separately, each with a different substitution.
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