Question 1045447
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The answer must be given In radians. Thanks!
2cos^2x + 3cosx -2 = 0 
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Factor::
(2cos(x)-1)(cos(x)+2) = 0
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cos(x) = 1/2 or cos(x) = -2 (extraneous)
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x = arccos(1/2) = pi/3 or x = (5/3)pi