মান নির্ণয় করো :
\(\cfrac{5cos^2\cfrac{\pi}{3}+4sec^2\cfrac{\pi}{6}-tan^2\cfrac{\pi}{4}}{sin^2\cfrac{\pi}{6}+cos^2\cfrac{\pi}{6}}\) Madhyamik 2020


\(\cfrac{5\cos^2\cfrac{\pi}{3}+4\sec^2\cfrac{\pi}{6}-\tan^2\cfrac{\pi}{4}}{\sin^2\cfrac{\pi}{6}+\cos^2\cfrac{\pi}{6}}\)
\(=\cfrac{5\cos^2 60^o+4\sec^230^o-\tan^245^o}{\sin^230^o+\cos^230^o}\)
\(=\cfrac{5(\cfrac{1}{2})^2+4(\cfrac{2}{\sqrt3})^2-(1)^2}{(\cfrac{1}{2})^2+(\cfrac{\sqrt3}{2})^2}\)
\(=\cfrac{5\times\cfrac{1}{4}+4\times\cfrac{4}{3}-1}{\cfrac{1}{4}+\cfrac{3}{4}}\)
\(=\cfrac{\cfrac{5}{4}+\cfrac{16}{3}-1}{\cfrac{1+3}{4}}\)
\(=\cfrac{\cfrac{15+64-12}{12}}{1}\)
\(=\cfrac{67}{12}\)
\(=5\cfrac{7}{12}\) (Answer)

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