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Principal Value of $$\cos^{-1}\left(-\frac12\right)$$
## Formula
$$\cos^{-1}\left(-\frac12\right)=\frac{2\pi}3$$
## Usage
- Used for direct evaluation of standard inverse cosine values.
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Principal Value of $$\cos^{-1}\left(-\frac12\right)$$
## Formula
$$\cos^{-1}\left(-\frac12\right)=\frac{2\pi}3$$
## Usage
- Used for direct evaluation of standard inverse cosine values.
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