求 lim x-∞ x*sin(1/x)
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求limx-∞x*sin(1/x)求limx-∞x*sin(1/x)求limx-∞x*sin(1/x)lim(x->∞)x*sin(1/x)lety=1/xx->∞,y->0lim(x->∞)x*si
求 lim x-∞ x*sin(1/x)
求 lim x-∞ x*sin(1/x)
求 lim x-∞ x*sin(1/x)
lim( x->∞) x*sin(1/x)
let y =1/x
x->∞ , y->0
lim( x->∞) x*sin(1/x)
=lim(y->0) siny /y
=1
求 lim x-∞ x*sin(1/x)
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