\lim _{x \rightarrow 0} \frac{\tan x+1-\tan 2 x-3 \tan 3 x}{x^{2} \cdo – InterviewSolution

1.	\lim _{x \rightarrow 0} \frac{\tan x+1-\tan 2 x-3 \tan 3 x}{x^{2} \cdot \tan x}
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