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      Question

      If Sin 3A = Cos (A - 46°) where 3A is acute angle,

      then the Value of A is
      A 56┬░ Correct Answer Incorrect Answer
      B 44┬░ Correct Answer Incorrect Answer
      C 46┬░ Correct Answer Incorrect Answer
      D 34┬░ Correct Answer Incorrect Answer

      Solution

      Sin 3A = Cos (A - 46°) Sin 3A = Sin [90° -(A - 46°)] 3A = 90° - A + 46° 4A = 136° A = 34°

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