lim(x→0)=(1/x^2-cot^2x)lim(x→∞)=[(2+x)e^(1/x)-x]
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lim x→0 (cot x)^tan 2x=
lim(x→0)=(1/x^2-cot^2x)lim(x→∞)=[(2+x)e^(1/x)-x]
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