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Trigonometry
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OpenStudy (anonymous):
Solve 5cosx + 1 = 3cosx
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OpenStudy (hba):
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OpenStudy (anonymous):
Combine liketerms 2cosx=-1 then: \[x = Arccos(\frac{ -1 }{ 2 })\] \[x=120 ^{o} or \frac{ 2\pi }{ 3}\]
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