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Trigonometry 6 Online
OpenStudy (anonymous):

Find y using a reference triangle: y= arccos (-1)

OpenStudy (anonymous):

y=pi as cos gives -1 at every odd multiple of pi...

OpenStudy (anonymous):

I know that it equals pi. But I don't understand the reference triangle. It looks like this, right? |dw:1403892024171:dw|

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