Q.35. The value of ${\int }_0^{T/2}\sin \frac{2\mathrm{\pi t}}{T}dt$ is equal to
(1) Zero
(2) $\frac{T}{\mathrm{\pi }}$
(3) $\frac{2T}{\mathrm{\pi }}$
(4) $\frac{2}{\mathrm{\pi }}$