lim(x→无穷大)xsin1/x=?

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lim(x→无穷大)xsin1/x=?lim(x→无穷大)xsin1/x=?lim(x→无穷大)xsin1/x=?令t(x)=1/x则lim(x→∞)xsin1/x=lim(x→∞)1/t(x)*si

lim(x→无穷大)xsin1/x=?
lim(x→无穷大)xsin1/x=?

lim(x→无穷大)xsin1/x=?
令t(x) = 1/x则
lim(x→∞)xsin1/x = lim (x→∞) 1/t(x) * sin t(x)
由于当x→∞时t(x)→0,因此
lim (x→∞) 1/t(x) * sin t(x) = lim(t→0) (sin t)/t = 1.