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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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