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OpenStudy (anonymous):
(1+cosx)/(1-cosx)=0
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OpenStudy (solomonzelman):
Hint: cotangent half angle formula.
OpenStudy (solomonzelman):
This is a help site, I am not going to do your work or give you a straight answer. We are helping students like you learn :)
OpenStudy (solomonzelman):
Please show some effort.
OpenStudy (anonymous):
I'm trying to help my son and refreshing my memory. it has been 30 yrs since high school for me
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