materi tentang limit fungsi,tolong

1.
lim √x = 2
x->4
masukan lim x->4
√4 = 2
2= 2 terbukti

2.
lim 1/x = 1/3
x->3
masukan lim x->3
1/3 = 1/3 terbukti

3.
lim 1/x = 1/c
x->c
1/c =1/c terbukti

4.
lim x⁴-6 = 10
x->2
masukan lim x->2
2⁴-6= 10
16-6= 10
10= 10 terbuktii