\(sin3\theta =\cfrac{1}{2}\) হলে \(cos(80°+\theta)\)) এর মান -------
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\(sin3\theta =\cfrac{1}{2}\) হলে \(cos(80°+\theta)\)) এর মান 0
\(sin3\theta =\cfrac{1}{2}=sin 30^o\)
বা, \(3\theta=30^o\)
বা, \(\theta=10^o\)

\(\therefore cos(80°+\theta)=cos(80^o+10^o)=cos 90^o =0\)


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