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      Question

      Find the exact value of cos

      120°.
      A 1 Correct Answer Incorrect Answer
      C -0.5 Correct Answer Incorrect Answer
      D 0.5 Correct Answer Incorrect Answer

      Solution

      ATQ, cos 120° =  cos(90 + 30) = - Sin 30° =  -(1/2) 0r -0.5

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