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$\mbox{None of the above}$

$f(x)=-\dfrac{\pi}{4}+\sum_{n=1}^{\infty}\left [\dfrac{2\cos(2n-1)x}{\pi(2n-1)}+\dfrac{(-1)^{n+1}\sin nx}{n^2}\right ]$

$f(x)=-\dfrac{\pi}{4}+\sum_{n=1}^{\infty}\left [\dfrac{2\cos(2n-1)x}{\pi(2n-1)^2}+\dfrac{(-1)^{n+1}\sin nx}{n}\right ]$

$f(x)=-\dfrac{\pi}{4}+\sum_{n=1}^{\infty}\left [\dfrac{(-1)^{n+1}2\cos(2n-1)x}{\pi(2n-1)}+\dfrac{\sin nx}{n^2}\right ]$

$f(x)=-\dfrac{\pi}{4}+\sum_{n=1}^{\infty}\left [\dfrac{(-1)^{n+1}2\cos(2n-1)x}{\pi(2n-1)^2}+\dfrac{\sin nx}{n}\right ]$

Test:	DELA-Section 5.4-Fourier series-Hard
Number of Questions:	1
Time:

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