\(tan \theta =\cfrac{5}{7}\) হলে, \(\cfrac{5sin\theta + 7cos\theta}{7 sin \theta + 5 cos \theta}\) এর মান নির্ণয় করো । Madhyamik 2025
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\(tan \theta =\cfrac{5}{7}\)
বা, \(\cfrac{sin \theta}{cos \theta}=\cfrac{5}{7}\)

ধরি, \(sin\theta=5k\) এবং \(cos\theta=7k\)

\(\cfrac{5sin\theta + 7cos\theta}{7 sin \theta + 5 cos \theta}\)
\(=\cfrac{5.5k + 7.7k}{7 .5k + 5 .7k}\)
\(=\cfrac{25k + 49k}{35k + 35k}\)
\(=\cfrac{74k}{70k}\)
\(=\cfrac{37}{35}\) [Answer]


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