# Inverse cosine calculator

**Note**
- Enter the value of x and unit in order to calculate inverse cos values

- Click on the calculate button.

**Example of Few questions where you can use this formula**
- Find the value of $cos^{-1} 0$ in radian

- Find the value of $cos^{-1} 1$ in radian

- Find the value of $cos^{-1} .25$ in °

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