(nsin1/n)^n^2
=[(1+nsin1/n-1)^(1/(nsin1/n-1)]^(nsin1/n-1)n^2
底数：[(1+nsin1/n-1)^(1/(nsin1/n-1)]趋于e
指数：(nsin1/n-1)n^2趋于0
原极限=1
求limn→∞（nsin1/n)^n^2
(nsin1/n)^n^2
=[(1+nsin1/n-1)^(1/(nsin1/n-1)]^(nsin1/n-1)n^2
底数：[(1+nsin1/n-1)^(1/(nsin1/n-1)]趋于e
指数：(nsin1/n-1)n^2趋于0
原极限=1