Class 11 Book Solution from S N Dey in Trigonometric Functions of Associated Angles Question No: 5.2.1(iv)

মান নির্ণয় করো : \(cos^2\frac{\pi}{8}+cos^2\frac{3\pi}{8}+cos^2\frac{5\pi}{8}+cos^2\frac{7\pi}{8}\)

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