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      Question

      If 17sin A = 8, where

      0
      A 5/3 Correct Answer Incorrect Answer
      B 1/4 Correct Answer Incorrect Answer
      C 4 Correct Answer Incorrect Answer
      D 3/5 Correct Answer Incorrect Answer

      Solution

      17sin A = 8

      Or, sin A = (8/17)

      Using sin 2  A + cos 2  A = 1

      cos 2  A = 1 - sin 2  A

      Or, cos 2  A = 1 - (8/17)  2

      Or, cos 2  A = 1 - (64/289)

      Or, cos A = (225/289)

      Or, cos A = (15/17) Image

      But 0

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