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Answer in Math for Asad Ali #201556

Expand Fourier series f(x)=cos x limit -pi/2 to pi/2 “f(x)=\dfrac{a_0}{2}+\displaystyle\sum_{n=1}^{\infin}\bigg(a_n\cos (\dfrac{n\pi x}{L})+b_n\sin (\dfrac{n\pi x}{L})\bigg)” “a_0=\dfrac{1}{L}\displaystyle\int_{-L}^{L}f(x)dx” “a_n=\dfrac{1}{L}\displaystyle\int_{-L}^{L}f(x)\cos (\dfrac{n\pi x}{L})dx” “b_n=\dfrac{1}{L}\displaystyle\int_{-L}^{L}f(x)\sin(\dfrac{n\pi…