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Math Help - Trigonometric Integrals

  1. #1
    !!!
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    Trigonometric Integrals

    While checking my works to my answers manual, I realized one of the steps I have a hard time understanding:

    How did the integrals from pi/2 to 3pi/4 turn into 1 to rt2/2? I thought since u = sin x, doesn't x = pi/2 means that u = sin(3pi/4) = 1/rt2 instead of rt2/2?
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  2. #2
    da`
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    rt2/2 is the same as 1/rt2

    if that is what the question is? if not i blame it on being tired sorry
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  3. #3
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    Oh, right, I remember now. Thanks!
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