Question

    Evaluate the following: sin 50° × cos 20°

    − sin 20° × cos 50°
    B 1 Correct Answer Incorrect Answer
    C 1/2 Correct Answer Incorrect Answer
    D 1/√2 Correct Answer Incorrect Answer

    Solution

    We know that, sin (a − b) = sin a × cos b − cos a × sin b So, sin 50° × cos 20° − sin 20° × cos 50°
    = sin (50° − 20°)
    = sin 30°
    = 1/2

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