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Math Help - Evaluate Definite trig integral

  1. #1
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    Evaluate Definite trig integral

    Hi all,
    I have the following Question and my answer is not tying up with the answer given in the text book-it's probably me but this book has been wrong a few times already.
    So that i do not waste anymore time can somebody tell me whether it's me or not?

    Evaluate Integration sign(cos x.dx) between (pi/4) and 0.

    Sorry must look at how to use tex...

    The integral of cos x is sin x, and sin(pi/4)-sin(0)=0.0137

    The book gives 0.707?

    Help appreciated
    John
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  2. #2
    MHF Contributor alexmahone's Avatar
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    Re: Evaluate Definite trig integral

    Quote Originally Posted by celtic1234 View Post
    Hi all,
    I have the following Question and my answer is not tying up with the answer given in the text book-it's probably me but this book has been wrong a few times already.
    So that i do not waste anymore time can somebody tell me whether it's me or not?

    Evaluate Integration sign(cos x.dx) between (pi/4) and 0.

    Sorry must look at how to use tex...

    The integral of cos x is sin x, and sin(pi/4)-sin(0)=0.0137

    The book gives 0.707?

    Help appreciated
    John
    You need to change your calculator's mode from degrees to radians.
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  3. #3
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    Re: Evaluate Definite trig integral

    thank you-feeling silly!
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  4. #4
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    e^(i*pi)'s Avatar
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    Re: Evaluate Definite trig integral

    Also 0.707 \approx \dfrac{\sqrt2}{2}
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