求lim(x→0)x cos 1/x lim(x→∞)x^2/ (3x-1)的极限
求lim(x→0)x cos 1/x lim(x→∞)x^2/ (3x-1)的极限
求 lim(x→∞)[sin(2/x)+cos(1/x)]^x的极限.
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lim(x→∞)(x^2+x)/(x^4-3x-1)的极限