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Approximation of Reciprocal
## Formula
For:
$$|x|\ll1$$
$$\frac1{1+x}\approx1-x+x^2-x^3+\cdots$$
For first-order approximation:
$$\frac1{1+x}\approx1-x$$
## Usage
- Used for quick numerical approximations involving reciprocals.
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Approximation of Reciprocal
## Formula
For:
$$|x|\ll1$$
$$\frac1{1+x}\approx1-x+x^2-x^3+\cdots$$
For first-order approximation:
$$\frac1{1+x}\approx1-x$$
## Usage
- Used for quick numerical approximations involving reciprocals.
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