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Relation Between $$\cos^{-1}x$$ and $$\tan^{-1}x$$
## Formula
For:
$$-1<x\le1$$
$$\cos^{-1}x=\tan^{-1}\left(\frac{\sqrt{1-x^2}}x\right)$$
with the appropriate quadrant adjustment when $$x<0$$.
## Usage
- Used to express inverse cosine through inverse tangent.
