\(tan \theta=\cfrac{8}{15}\) হলে, \(sin \theta\) র মান নির্ণয় করো। Madhyamik 2023


\(tan \theta=\cfrac{8}{15}\)
বা, \(tan^2 \theta=\left(\cfrac{8}{15}\right)^2\)
বা, \(tan^2 \theta=\cfrac{64}{225}\)
বা, \(cot^2 \theta=\cfrac{225}{64}\)
বা, \(1+cot^2 \theta=1+\cfrac{225}{64}\)
বা, \(cosec^2 \theta=\cfrac{289}{64}\)
বা, \(cosec \theta=\sqrt{\cfrac{289}{64}}=\cfrac{17}{8}\)

\(\therefore sin\theta=\cfrac{1}{cosec \theta}=\cfrac{8}{17}\)

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