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Prove the following identities: \[{{\operatorname{Cos}}^{2}}\frac{\pi }{8}+{{\operatorname{Cos}}^{2}}\frac{3\pi }{8}+{{\operatorname{Cos}}^{2}}\frac{5\pi }{8}+{{\operatorname{Cos}}^{2}}\frac{7\pi }{8}=2\]
Prove the following identities: \[{{\operatorname{Cos}}^{2}}\frac{\pi }{8}+{{\operatorname{Cos}}^{2}}\frac{3\pi }{8}+{{\operatorname{Cos}}^{2}}\frac{5\pi }{8}+{{\operatorname{Cos}}^{2}}\frac{7\pi }{8}=2\]
CBSE | Class 11 | Exercise 9.1 | Maths | RD Sharma | Trigonometric Functions at Multiples and Submultiples of an Angle
Prove the following identities: \[{{\operatorname{Cos}}^{2}}\frac{\pi }{8}+{{\operatorname{Cos}}^{2}}\frac{3\pi }{8}+{{\operatorname{Cos}}^{2}}\frac{5\pi }{8}+{{\operatorname{Cos}}^{2}}\frac{7\pi }{8}=2\]

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