Composition of $$\sec^{-1}x$$ with $$\sec$$

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Composition of $$\sec^{-1}x$$ with $$\sec$$

## Formula

$$\sec^{-1}(\sec x)=x,\quad x\in[0,\pi]\setminus\left\{\frac\pi2\right\}$$

## Usage

- Used when the angle lies within the principal range of inverse secant.

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