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    Calculating Partial Differential Equations

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    I need help computing the following integral where m and n are non-negative integers.
    a). cos (n*pi*x/L) cos(m*pi*x/L) dx
    b). cos (n*pi*x/L) sin(m*pi*x/L) dx

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    https://brainmass.com/math/partial-differential-equations/calculating-partial-differential-equations-130545

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    The solution is comprised of an example of solving partial differential equations in an attached Word document.

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