above Fourier series, that is, f_{1}(t)=\frac{1}{2}-\frac{1}{\pi} \sin (\pi t) \text { for }-2 \leq t \leq 2 \text { , with an increment of } \Delta t=0.1 (ii) plot the first three terms of the above Fourier series, that is, f_{2}(t)=\frac{1}{2}-\frac{1}{\pi} \sin (\pi t)-\frac{1}{2 \pi} \sin (2 \pi t) \text { for }-2
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