Pooja posted an Question
June 10, 2021 • 22:47 pm 30 points
  • IIT JAM
  • Physics (PH)

Fx) is a periodic function of x with period r and can be express as a fourier cosine series and f(x) = sinx then the coefficient of cos(4x) is 17. -tt (b) -1t (

fx) is a periodic function of x with period r and can be express as a Fourier cosine series and f(x) = sinx then the coefficient of cos(4x) is 17. -TT (B) -1t (A) 15 3 1 -1 (D) (C) 37T 157T

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    Ravi bhushan

    By seeing the options you can choose option 3 as a correct option.

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    If you see my solution then the coefficient will be -16/15pie

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    so in the third option there is -1/15pie. I think 6 is misprinted.

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    I have corrected my mistakes. You can see my second attachment.

  • comment-profile-img>
    Ravi bhushan best-answer

    Here is the detailed solution. I think options are wrong.

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    2sinA cos B = Sin(A+B ) + sin (A-B)

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    yess isske solution or options dono glt h

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    kaffi mistakes h inn books m

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    yes

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    Here is the detailed solution.

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    I don't know why they have given wrong solution and options.

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    Here I have corrected my mistakes. It was slip of pen.

  • Pooja

    bcz acc. too me there are 2-3 correction required in this solution ... due to which the answer is also not correct

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