Math Question
![Evaluate without a calculator:
\[
\sec 180^{\circ}
\]
[?]](https://d3hlidq5bf9vg0.cloudfront.net/app-server-student/2022/4/9/de8904c0-57e6-420a-a9df-8a14847c550b.png "Evaluate without a calculator:
\[
\sec 180^{\circ}
\]
[?]")
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