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OpenStudy (anonymous):
cos(2 arccos(4/7))
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OpenStudy (anonymous):
arccos(4/7) gives you the angle once you find the angle, multiply by 2 and then find cos i suggest using a calculator
OpenStudy (anonymous):
Ok.
OpenStudy (anonymous):
How would I do it by hand? I'm not really allowed to use a calculator during exams...
OpenStudy (anonymous):
not sure, i could show you if the 2 wasnt there but normally you would have to draw a triangle
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