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The master answers the questions of higher mathematics in liberal arts.
Multiply the numerator and denominator by y to get lim y * sin (xy)/(xy); The formula limx→0sinx/x= 1.

So the original formula is lime *1= 0;

It can also be understood that the higher order of sin(xy)~0(x) is infinitely small, and x~0 is infinitely small.

The formula is 0(x)/0=0.