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Thread: definite integrals

  1. March 9th 2008, 06:07 AM #1
    Diane Charlton
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    Unhappy definite integrals

    could someone please solve the following definite integrals please.

    <br /> \int_0^{\pi/2} ( sin4 \theta - cos4 \theta)~d\theta<br />

    <br /> \int_1^2(15x^3+e^2x-\frac{4}{x})dx<br />
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  2. March 9th 2008, 06:20 AM #2
    Deadstar
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    Well the integral of sin(4\Theta) is -\frac{1}{4}cos(4\Theta)

    And the integral of -cos(4\Theta) is -\frac{1}{4}sin(4\Theta)

    Does that help with the first one?
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