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hello this is a plane trigonometry question hopefully you can help I did every thing else it's just the last one I can't get the reference angle for five in this question

hello this is a plane trigonometry question hopefully you can help I did every thing else its just the last one I cant get the reference angle for five in this class=

Respuesta :

[tex]\theta=\frac{71}{36}\pi[/tex]

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