# Chapter 7 - Exponential Functions - 7.8 Inverse Trigonometric Functions - Exercises - Page 374: 14

Undefined.

#### Work Step by Step

Since $\sec\left(\frac{3\pi}{2}\right)$ is undefined, then $$\sec^{-1}\left(\sec\left(\frac{3\pi}{2}\right)\right)$$ is undefined.

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