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RD Chapter 6 Trigonometric Identities Ex 6.1 Solutions

Question - 21 : - sin2 A cot2 A+ cos2 A tan2 A = 1 (C.B.S.E. 1992C)

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Question - 22 : -

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Question - 30 : - sec6 θ= tan6  θ +3 tan2  θ sec2  θ + 1

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