求极限lim [(2x+6)sin(5/x)]/(4x+3) x+∞

求极限lim(x-->0)x^2 sin(1/x), 求极限 （（sin(x^3+x^2-x)+sin x) /x x→0 已知lim sinx/x=1 求极限 lim(x→∞)5x/(x-4) 求极限 lim(x→-∞)[(√1-x)-3] 求 lim(x→∞)[sin(2/x)+cos(1/x)]^x的极限. 求极限 1,lim(x→∞）（sinx/x +100) 2,lim(x→∞）xtan1/x 3,lim(x→1）sin^ 1.4求极限lim(x→∞) (x^2+x)/ (x^4-3x^+1) 求极限：lim(x->4)(x^2-6x+8)/(x^2-5x+4) 求极限lim (3x^3+5x^2+x) / (7x^3+5x-4) 求极限lim(x-->0) (tanX-sinX)/[(sin^3)X] lim x->0(sqrt(sin(1/x^2)) 求极限 求极限 lim sin(x^2 * sin (1/x))/x x->0 求极限lim∞>[sin(x^2) –x]/ [((cosx)^2)-x]