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    Question

    Which of the given trigonometric identities is incorrect

    ? 1. tan2┬а╬╕ = sec2┬а╬╕ - 1B. cosec2┬а╬╕ = 1 + cot2┬а╬╕3. cos 2╬╕ = cos2┬а╬╕ - sin2┬а╬╕4. sec ╬╕ X cot ╬╕ = sin ╬╕
    A 1 Correct Answer Incorrect Answer
    B 2 Correct Answer Incorrect Answer
    C 3 Correct Answer Incorrect Answer
    D 4 Correct Answer Incorrect Answer

    Solution

    We know that sec ╬╕ X cot ╬╕ = cosec ╬╕

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