lim x到0 (2/sin^2x减1/1-cosx)求极限

lim x到0 (2/sin^2x减1/1-cosx)求极限 lim(x(sin)^2) lim(x趋向0)ln(1+sin x)/x^2 求极限lim(x-->0)x^2 sin(1/x), 求极限 lim sin(x^2 * sin (1/x))/x x->0求极限 lim sin(x^2 * sin (1/x))/x x->0 lim x->0(sqrt(sin(1/x^2)) 求极限 求极限 （（sin(x^3+x^2-x)+sin x) /x x→0 已知lim sinx/x=1 1.lim x→0 3x/(sinx-x)2.lim x→0 (1-cosmx)/x^23.lim x→0 sin4x/[(√x+2)-√2]4.lim h →0 [sin(x+h)-sin(x-h)]/h lim(x趋向0) x^2 / (sin^2) * x/3 lim(x趋向0) x^2 / (sin^2) * x/3 lim(x->0) 1-x^2-e^(-x^2)/x*sin^(3)2x lim(sin(x^2*cos(1/x)))/x怎么做? lim(sin（x/2）)^1/（(1+cosx)） x到π 求极限 lim(x趋于0)(x^2-sin^2xcos^2x)/((x^2)sin^2x) lim(x→0) [1-cos(x^2)]/sin(x^2)tan(x^2)]=? lim(x趋近于0)(（1/sin^2 x）-(cos^2 x)/x^2)= 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