Question

    Evaluate the following: sin 25° × cos 65° +

    sin 65° × cos 25°
    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 25° × cos 65° + sin 65° × cos 25°
    = sin (25° + 65°)
    = sin 90°
    = 1

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