1/sin^2x-1/x^2 x趋向0求极限

lim(x趋向0)ln(1+sin x)/x^2 lim(x^2+y^2)sin(1/(x^2+y^2))X趋向0，Y趋向0 求此极限 求极限lim(x趋向于0)ln(1+x^2)/sin(1+x^2) 1/sin^2x-1/x^2 x趋向0求极限 当x趋向于0时,求:(1/sin^2x-1/x^2)的极限 求lim [sin(x^2-1)]/(x-1) x趋向于1的极限. 求sin(x^2-1)/(x-1)当x趋向于1的极限,给出讲解, x趋向于0,求ln(1+2x)/x X趋向于π,求lim((sin^2 X)/()1+cos^3 X) 求解当x趋向0时lim[sin(2^x)ln(x+1)]/(2^x-1) lim(1/（x^2-x)）*sin(π/x）x趋向于0请详解 当X趋向于0, 求sin^2(6x)/ sin^2( 2x) 的极限 当x趋向于0的时候,求lim{[ln(1+x^2)]/(sin(1+x^2)]}的极限 求lim(x趋向于0)1/(x^3)∫(上限为x下限为0)sin(t^2)dt [sin（x^2）sin(1/x)]/[ln(1+2x)]的极限（X趋向于0） lim(x趋向0) x^2 / (sin^2) * x/3 lim(x趋向0) x^2 / (sin^2) * x/3 lim x趋向无穷 {（2x^3+x)sin (2/x) }/ x^2+1