lim(1+cosx)的2secx次方 当x—>π/2 (派.的极限是多少~
问题描述:
lim(1+cosx)的2secx次方 当x—>π/2 (派.的极限是多少~
答
lim(1+cosx)^2secx=lim[(1+cosx)^1/cosx]^2=e^2
x—>π/2 x—>π/2