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    Evaluate the Integral

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    Evaluate (be careful if n=m)
    ∫ 0 --> L sin(n pi x/L) sin(m pi x/L) dx

    for n>0 and m>0. Use the trigonometric identity 2 sin a sin b = cos(a-b) - cos(a+b)

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    © BrainMass Inc. brainmass.com March 4, 2021, 6:20 pm ad1c9bdddf
    https://brainmass.com/math/trigonometry/evaluate-the-integral-40423

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