What is the general solution of the trigonometric equation ?

Answer and explanation

Correct answer: D. or

  1. Step 1: Use the double-angle identity : .
  2. Step 2: Factor out : .
  3. Step 3: Solve each factor: (i) ; (ii) .
Answer
or ().
Why not the others: The option with or gives roots for and ; The option with or gives instead of ; The option assumes .

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