lim xsinx/(arctan3x^2)x→0
lim(x→ 0)(tanx-sinx)/xsinx^2
lim x→0 1-cosx/xsinx
lim(x→0)(1-cos2x)/xsinx
lim(x→0)(1-cos4x)/xsinx
求极限 lim x趋近于3(arctan3x)/(2X) 求极限,
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lim (1/(xsinx)-1/x^2)x~0