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OpenStudy (aravindg):
trigonometry help plzzz
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OpenStudy (mimi_x3):
What's your question xD
OpenStudy (aravindg):
u can help?
OpenStudy (anonymous):
how can we help if we don't know your question lool
OpenStudy (aravindg):
if a+b+c=180 prove cos square +cos square b +cos square c=1-2*cos a*cos b*cosc
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