In the single-pulse width modulation method, the Fourier coefficient an is given by
(a) (Vs/π) [ cos(nπ/2) cos(nd) ].
(b) 0
(c) (4Vs/nπ) [sin(nπ/2) sin(nd)].
(d) (2Vs/nπ) [sin(nπ/2) sin(nd)].
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This key question is from PWM Inverters-1 topic in division Inverters of Power Electronics