Multiple Choice Question (MCQ)
If -\sin\theta + \dfrac{1}{\sin\theta } = 0, what is the size of the angle \theta ?
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✓
90\degree
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×
60\degree
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×
\45\degree
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×
30\degree
If -\sin\theta + \dfrac{1}{\sin\theta } = 0, what is the size of the angle \theta ?
90\degree
60\degree
\45\degree
30\degree
\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