=lim (2sin^2 x/2) /x^2为什么等于 1/2 lim (sin^2 x/2)/(x/2)^2

lim(x(sin)^2) 求极限 （（sin(x^3+x^2-x)+sin x) /x x→0 已知lim sinx/x=1 lim(x---1)[sin^2(x)-sin^2(1)]/[x-1]=?大学高等数学,求教. lim x→∞ (x+sin 2x)/2 求lim(x~无限大)(sin(x^(2)+5)/x^2) lim(x趋向0) x^2 / (sin^2) * x/3 lim(x趋向0) x^2 / (sin^2) * x/3 lim(sin(x^2*cos(1/x)))/x怎么做? lim(x趋向0)ln(1+sin x)/x^2 求极限lim(x-->0)x^2 sin(1/x), lim[(sin x)^tan x],x趋向于Pai/2 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(3*x^2+5)/(5x+3)sin(2/x)=多少?lim(3*x^2+5)/(5x+3)*sin(2/x)=多少？ 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)= lim(X-0) sin^2x/(x^2+x^3)=? x趋向无穷 lim x sin 2x/x²+1= 要具体过程