A) \[\tan \,{{55}^{o}}\]
B) \[\cot {{55}^{o}}\]
C) \[-\tan {{35}^{o}}\]
D) \[-\cot {{35}^{o}}\]
Correct Answer: A
Solution :
\[\frac{\cos {{10}^{o}}+\sin {{10}^{o}}}{\cos {{10}^{o}}-\sin {{10}^{o}}}\]\[=\tan ({{45}^{o}}+{{10}^{o}})=\tan {{55}^{o}}\].
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