Question
Which of the given trigonometric identities is incorrect
? 1. tan2 θ = sec2 θ - 1B. cosec2 θ = 1 + cot2 θ3. cos 2θ = cos2 θ - sin2 θ4. sec θ X cot θ = sin θSolution
We know that sec θ X cot θ = cosec θ
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