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Question

Solution to inequality cos 2x + 5 cos x + 3 ≥ 0 over left square bracket negative pi comma pi right square bracket is

  1. left square bracket negative pi comma pi right square bracket
  2. open square brackets fraction numerator negative 5 pi over denominator 6 end fraction comma fraction numerator 5 pi over denominator 6 end fraction close square brackets
  3. left square bracket 0 comma times pi right square bracket
  4. open square brackets fraction numerator negative 2 pi over denominator 3 end fraction comma fraction numerator 2 pi over denominator 3 end fraction close square brackets

The correct answer is: open square brackets fraction numerator negative 2 pi over denominator 3 end fraction comma fraction numerator 2 pi over denominator 3 end fraction close square brackets


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