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      Question

      Find the value of cos 15┬░ ├Ч cos 75┬░ + sin 15┬░ ├Ч sin

      75┬░:
      B 1 Correct Answer Incorrect Answer
      C 1/2 Correct Answer Incorrect Answer
      D 3/4 Correct Answer Incorrect Answer

      Solution

      Using the identity cos(A - B) = cos A cos B + sin A sin B, cos(75┬░ - 15┬░) = cos 60┬░ = 1/2. Correct option: c

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