(当n趋向∞)nsin(π/n)的极限怎么做?
网上解法为:
(当n趋向∞)
nsin(π/n)
=n[sin(π/n)]/(π/n)*(π/n)
令t=π/n,所以n[sin(π/n)]/(π/n)*(π/n)=n(sint)/t*(π/n)
=n*(π/n)
=π
此题运用了lim(x→∞)sinx/x=1这一定律,但nsin(π/n)=n[sin(π/n)]/(π/n)*(π/n),其中的等号后分母中的(π/n)*(π/n)是怎么来的,求解?