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    Question

    Find the value of (sinθ + cosθ)² + (sinθ –

    cosθ)².
    A 4 Correct Answer Incorrect Answer
    C 2 Correct Answer Incorrect Answer
    D 1 Correct Answer Incorrect Answer

    Solution

    (sin θ + cos θ ) ² + (sin θ cos θ )2 = sin2 θ + cos2 θ + 2 sin θ cos θ + sin2 θ + cos2 θ - 2 sin θ cos θ = 2 (sin2 θ + cos2 θ) = 2 (1) =2

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