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Approximation of Reciprocal Square Root
## Formula
For:
$$|x|\ll1$$
$$\frac1{\sqrt{1+x}}\approx1-\frac x2+\frac{3x^2}{8}$$
For first-order approximation:
$$\frac1{\sqrt{1+x}}\approx1-\frac x2$$
## Usage
- Used to approximate expressions containing reciprocal square roots.
