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    Question

    If tanθ = x then find the value of cos

    2θ?
    A (1+ x²)/(1- x²) Correct Answer Incorrect Answer
    B (1+ x²)/(1 + x²) Correct Answer Incorrect Answer
    C (1 - x²)/(1- x²) Correct Answer Incorrect Answer
    D (1 - x²)/(1 + x²) Correct Answer Incorrect Answer

    Solution

    cos 2θ = (1-tan²θ)/(1+tan²θ) = (1 - x²)/(1 + x²)

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