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I need to find a coterminal angle to $(13\pi)/7$ between $0$ and $2\pi$.

I'm not sure how to approach this problem as adding $2\pi$ would put me over the domain and subtracting $2\pi$ would put me under. I am told that this is solvable though.

Thanks in advance!

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Add zero, perhaps?!? –  Hans Lundmark Sep 17 '11 at 20:15
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A terminal side determines a unique angle in $[0,2\pi)$ in standard position; the only angle coterminal to $13\pi/7$ that lies in $[0,2\pi)$ is $13\pi/7$ itself. –  Arturo Magidin Sep 17 '11 at 20:18

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up vote 2 down vote accepted

How about $\frac{13\pi}{7}$ (if equal angles are coterminal) ?

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Thanks, that's it! –  KubaSub Sep 17 '11 at 20:17

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