Inverse Cosine of a Cotangent Expression

Rarely Tested

Inverse Cosine of a Cotangent Expression

## Formula

For $$x>0$$:

$$\cos^{-1}\left(\frac{x}{\sqrt{1+x^2}}\right)=\cot^{-1}x$$

## Usage

- Used to convert inverse cosine expressions into inverse cotangent form.

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