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What am I doing wrong in this integal question? watch

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    I got 2.57 but answer is pi/4... Does anyone know how they got that :/
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    Question seems to have a printing error. You sure it wasn't cos^2 2x?
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    (Original post by DFranklin)
    Question seems to have a printing error. You sure it wasn't cos^2 2x?
    Yeah I tried that too and got 0 as the answer
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    (Original post by ℓove)
    Yeah I tried that too and got 0 as the answer
    Integral of cos^2 2x between -pi/4 and pi/4 is pi/4
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    (Original post by DFranklin)
    Integral of cos^2 2x between -pi/4 and pi/4 is pi/4
    Right I will check my working

    Thanks
 
 
 
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