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    • Question

      Find the value of sin²12° + sin²78° + cos²24° +

      cos²66°.
      A 1 Correct Answer Incorrect Answer
      B 2 Correct Answer Incorrect Answer
      C 3 Correct Answer Incorrect Answer
      D 4 Correct Answer Incorrect Answer

      Solution

      sin²12° + sin²(90° − 12°) + cos²24° + cos²(90° − 24°)
      = sin²12° + cos²12° + cos²24° + sin²24°
      = 1 + 1 = 2

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