複選題All the following questions are multiple-choice questions.
1.You can expand the function defined by f(x)=x2+3, 0＜x＜3 in a Fourier series, a
cosine series, or a sine series. Please choose the correct answers.
(A)1(6) = 3 for Fourier sine series；
(B)(3) = 12 for Fourier cosine series；
(C) (0) = 3 for Fourier
series；
(D) (-1) = 4 for Fourier sine series
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