Value of \( \int_{0}^{\pi / 2} \cos 3 t d t \) is....

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Question Value of \( \int_{0}^{\pi / 2} \cos 3 t d t \) is
(A) \( \frac{2}{3} \)
(B) \( -\frac{1}{3} \)
(C) \( -\frac{2}{3} \)
(D) \( \frac{1}{3} \)📲PW App Link - https://bit.ly/YTAI_PWAP 🌐PW Website - https://www.pw.live



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