Question

(x-sinx)/x的立方 当x趋向于0时=多少

Answer 1

lim(x->0)(3sinx-sin3x)/x^3(0/0)=lim(x->0)(3cosx-3cos3x)/(3x^2)(0/0)=lim(x->0)(-3sinx+9sin3x)/(6x)(0/0)=lim(x->0)(-3cosx+27cos3x)/6=24/6=4