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Math Help - A few questions about integrals

  1. #1
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    A few questions about integrals

    Hello!

    I am having problem solving this one:

    ∫ -y/(x^2+y^2)dx
    ∫t* sqrt(1+4t^2) dt


    Finding g(x) in the following equation:

    (g'(x)-g(x))x sin xy = 0
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  2. #2
    MHF Contributor harish21's Avatar
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    Quote Originally Posted by tinyone View Post
    Hello!

    I am having problem solving this one:

    ∫ -y/(x^2+y^2)dx
    Think of trigonometric functions. You'll have to use Inverse tangent function here..

    Quote Originally Posted by tinyone View Post
    ∫t* sqrt(1+4t^2) dt
    Use the substitution rule.. let u=4t^2+1

    show your work if you are having any problems.
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