计算极限x→ -2时lim(x²-3x+2/x²-4)写出过程,
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求极限lim(x→2)(x^2-3x+2)/(x^2+4x-12)
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x →0时lim(1+x^2)^cot^2x求极限要详细过程.
计算下列极限1.lim(x→0)x^3-x^2+4x/x^2+x; 2. lim(x→0)x/根号1+x- 根号1-x