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OpenStudy (anonymous):
Prove 2 cos^2 B - cosB = 0
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OpenStudy (zehanz):
It cannot be proven for every value of B. You can factor it: cosB(2cosB - 1)=0. If it is just an equation, it can be solved: it is true if cosB = 0 or if cosB = ½. Solve these for B and you'll have done all you can ;)
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