\(\cfrac{9}{cosec^2\theta}+4cos^2 \theta+\cfrac{5}{1+tan^2\theta}\) এর সংখ্যাগত মান নির্ণয় করো।
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\(\cfrac{9}{cosec^2\theta}+4cos^2 \theta+\cfrac{5}{1+tan^2\theta}\)
\(=9sin^2\theta+4cos^2 \theta+\cfrac{5}{sec^2\theta}\)
\(=9sin^2\theta+4cos^2 \theta+5cos^2\theta\)
\(=9sin^2\theta+9cos^2 \theta\)
\(=9(sin^2\theta+cos^2 \theta)\)
\(=9\times 1\)
\(=9\) [Answer]

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