\( 2 cos3\theta=1 \)হলে, \(\theta\)-এর মান (a) 10° (b) 15° (c) 20° (d) 30°
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Answer: C
\( 2 cos3\theta=1 \)
বা, \( cos3\theta=\cfrac{1 }{2}=cos 60^o\)
বা, \(3\theta=60^o\)
বা, \(\theta=20^o\)


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