Value of \( \int_{0}^{\pi / 2} \cos 3 t \mathrm{dt} \) is: \( \math...

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Value of \( \int_{0}^{\pi / 2} \cos 3 t \mathrm{dt} \) is:
\( \mathrm{P} \)
(A) \( \frac{2}{3} \)
(B) \( -\frac{1}{3} \)
(C) \( -\frac{2}{3} \)
(D) \( \frac{1}{3} \)
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