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Inverse Cosine of $$\frac{1-x^2}{1+x^2}$$
## Formula
For $$x\ge0$$:
$$\cos^{-1}\left(\frac{1-x^2}{1+x^2}\right)=2\tan^{-1}x$$
## Usage
- Used to convert rational expressions into inverse tangent form.
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Inverse Cosine of $$\frac{1-x^2}{1+x^2}$$
## Formula
For $$x\ge0$$:
$$\cos^{-1}\left(\frac{1-x^2}{1+x^2}\right)=2\tan^{-1}x$$
## Usage
- Used to convert rational expressions into inverse tangent form.
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