lim(x→1)[(cos(π/2)x]/(1-x)

问题描述:

lim(x→1)[(cos(π/2)x]/(1-x)

lim(x→1)[(cos(π/2)x]/(1-x)
=
lim(x→1)[(-π/2sin(π/2)x]/(-1)
=π/2