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OpenStudy (anonymous):
solve: 0=cos(2x)+3cosx-1, 0
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OpenStudy (anonymous):
cos(2x) = 1 - 2cos^2x -2cos^2x + 3cosx = 0 let cosx = u -2u^2 + 3u = 0 use quadratic formula to solve for u once u is solved, cosx = u
OpenStudy (anonymous):
there cosx = 1.5 or cosx = 0
OpenStudy (anonymous):
therefore*
OpenStudy (anonymous):
ohh thank you
OpenStudy (anonymous):
no prob
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