Multiple Choice Question (MCQ)

If -\sin\theta + \dfrac{1}{\sin\theta } = 0, what is the size of the angle \theta ?

  1. 90\degree

  2. ×

    60\degree

  3. ×

    \45\degree

  4. ×

    30\degree

Collected in the board: Trigonometry

Steven Zheng posted 1 week ago

Answer

  1. \because -\sin\theta + \dfrac{1}{\sin\theta } = 0

    -\sin^2\theta+1 = 0

    \sin\theta =\pm1

    \theta =90\degree \text{ or } \theta =270\degree

    Therefore A is the correct option

Steven Zheng posted 1 week ago

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