A) \[\tan 54{}^\circ \]
B) \[\tan 36{}^\circ \]
C) \[\tan 18{}^\circ \]
D) None of these
Correct Answer: A
Solution :
\[=\sin \theta .\sin \theta +\cos \theta .\cos \theta =1\]\[=\tan \,\left( {{45}^{o}}+{{9}^{o}} \right)=\tan {{54}^{o}}\].
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