# Chapter 5 - Trigonometric Functions - 5.1 Angles - 5.1 Exercises: 105

$-90^\circ+n\times 360^\circ$

#### Work Step by Step

In order to find the coterminal angles of a quadrantal angle, we have to add or subtract $360^\circ$. The expression that generates all coterminal angles is: $-90^\circ+n\times 360^\circ$, as $n$ can be any integer, we can add or subtract any multiple of $360^\circ$.

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