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OpenStudy (anonymous):
Solve over [0,360): 2cos^2 x-9cosx=5
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OpenStudy (anonymous):
It's trig, and i need to know it for a test today
OpenStudy (anonymous):
Take cos x = t and make a quadratic equation and get the roots of t
OpenStudy (anonymous):
|dw:1335874323055:dw| |dw:1335874421291:dw|
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