A) \[0{}^\circ \]
B) \[30{}^\circ \]
C) \[45{}^\circ \]
D) \[90{}^\circ \]
Correct Answer: C
Solution :
\[\sin \theta =\frac{2+1}{\sqrt{2}\times \sqrt{9}}\,\,\Rightarrow \,\,\theta ={{45}^{o}}\].
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