(2sin^2 37° + 1 + 2sin^2 53°)/(3cos^2 18° – 2 + 3cos^2 72°)

প্রশ্ন

\dfrac{2\sin^2 37^\circ + 1 + 2\sin^2 53^\circ}{3\cos^2 18^\circ - 2 + 3\cos^2 72^\circ}

এর মান কত?

উত্তর

\dfrac{2\sin^2 37^\circ + 1 + 2\sin^2 53^\circ}{3\cos^2 18^\circ - 2 + 3\cos^2 72^\circ} এর মান 3

ব্যাখ্যা / সমাধান

\dfrac{2\sin^2 37^\circ + 1 + 2\sin^2 53^\circ}{3\cos^2 18^\circ - 2 + 3\cos^2 72^\circ}

\dfrac{2(\sin^2 37^\circ + \sin^2 53^\circ)+ 1 }{3(\cos^2 18^\circ + 3\cos^2 72^\circ) - 2}

\dfrac{2{\sin^2 37^\circ + \cos^2 (90^\circ-53^\circ)} + 1 }{3{\cos^2 18^\circ + \sin^2 (90^\circ - 72^\circ)} - 2}

\dfrac{2(\sin^2 37^\circ + \cos^2 37^\circ)+ 1 }{3(\cos^2 18^\circ + \sin^2 18^\circ) - 2}

= \dfrac{2\times 1 + 1}{3 \times 1 - 2}

= \dfrac{3}{1} = 3 (Answer)

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