Math, asked by palakj9114, 11 months ago

prove that
${cos}^{2} \frac{\pi}{8} + {cos}^{2} \frac{3\pi}{8} + {cos}^{2} \frac{5\pi}{8} + { cos }^{2} \frac{7\pi}{8} = 2$

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Answered by sohamsabale2021

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