lim(x趋于0时)secx - 1/x^2 ,
问题描述:
lim(x趋于0时)secx - 1/x^2 ,
答
lim(x趋于0时)secx - 1/x^2 =lim(x趋于0时)secxtanx/2x= lim(x趋于0时)secxtan²x+(secx)^3/2
=1/2