Answer :

Notice that:

[tex]\frac{13}{2}\pi=6\pi+\frac{1}{2}\pi=8\pi-\frac{3}{2}\pi.[/tex]

Therefore, the given angle is coterminal with:

[tex]-\frac{3}{2}\pi.[/tex]

Answer:

[tex]-\frac{3}{2}\pi.[/tex]

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