Find the power series expansion of the following functions at (x - c)
1
1n（1+t）
1. f(x) =
c =0
4. f（x） =
t
dt, c = 0 and x > 0
2+ x
1
JO
2. f(x) =
, C = 0
V9 - x2
3. f(x) = cos x, c = 0
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