lim(x→0){1/x-cotx} =

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lim(x→0){1/x-cotx} =
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lim(x→0){1/x-cotx} =
lim(x→0){1/x-cotx} =

lim(x→0){1/x-cotx} =
看图
加分啊

lim(x→0){1/x-cotx} =lim(x→0){(sinx-xcosx)/(x*sinx)} =lim(x→0){(sinx-xcosx)/(x*x)}=罗必达lim(x→0){(cosx-cosx+xsinx)/(2*x)}=lim(x→0){(sinx)/(2)}=0