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Mathematics 21 Online
OpenStudy (anonymous):

evaluate cot -220 degrees

OpenStudy (luigi0210):

Do you know your unit circle?

OpenStudy (anonymous):

kinda

OpenStudy (luigi0210):

Do you know what type of triangle 220 is? A 30, 60?

OpenStudy (anonymous):

yes

OpenStudy (luigi0210):

Alright, what type of triangle is it?

OpenStudy (anonymous):

basic right triangle. 30,60,90

OpenStudy (luigi0210):

Yes, but which one specifically? :P

OpenStudy (luigi0210):

If we draw the angle, we can see it is a 30. |dw:1400648181970:dw|

OpenStudy (luigi0210):

Meaning we have to use this one: |dw:1400648295438:dw| Right?

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