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    • 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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