\(\cot \left[\tan^{-1} \dfrac{1}{2}+\tan^{-1} \dfrac{1}{8}\right]= \ ? – McqOptions

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1.	\(\cot \left[\tan^{-1} \dfrac{1}{2}+\tan^{-1} \dfrac{1}{8}\right]= \ ?\)
A.	3/2
B.	-1
C.	\(\sqrt{2}\)
D.	\(-\sqrt{2}\)
Answer» B. -1

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