In each of the following cases, find a δ such that |f(x) − l| < ε for all x satisfying 0 <
|x − a| < δ.
(a) f(x) = x
3
; a = 1; l = 1.
(b) f(x) = x
x2+1 ; a = 1; l =
1
2
.
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