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Binomial approximation
(
1
+
x
)
a
≈
1
+
a
x
.
(1+x)^a \approx 1+ax.
(
1
+
x
)
a
≈
1
+
a
x
.
Assuming
∣
x
∣
<
1
|x| < 1
∣
x
∣
<
1
and
∣
a
x
∣
≪
1
|ax| \ll 1
∣
a
x
∣
≪
1
. This is used a lot in relativity.
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