誰能幫我解幾道極限的題目?
1 求f(x)=sin2x+tan(x/2)周期
2 lim(x^n-1)/(x-1) (n為正整數(shù))
x-1
3 lim(根號(hào)(2x+1)-3)/(根號(hào)(x-2)-根號(hào)2)
x-4
4 lim(根號(hào)(x^2+x+1)-根號(hào)(x^2-x+1))
x-正無窮
5 lim{根號(hào)[(x+p)(x+q)]-x}
x-正無窮
6 lim(x^2+1)(3+cosx)/(x^3+x)
x-無窮
7 lim(1/(x+1)+1/(x^2-1))
x--1
8 lim(sinx^2-x)/[((cosx)^2)-x]
x-無窮