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


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