Answered

How to find the reference angle of -11pi/3 ? 

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Ryan2id
Just replace π by 180°

[tex]\boxed{-\frac{11\pi}{3}=-\frac{11*180}{3}=-660^o=60^o}[/tex]
[tex]- \frac{11 \pi }{3} \\ \\ =- \frac{11*180}{3} \\ \\ =- \frac{1980}{3}[/tex]

[tex]=-660[/tex] °

= 60 °

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