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May 28, 2015

Homework Help: Math

Posted by Kate on Saturday, July 23, 2011 at 12:19pm.

Which of the following is a solution to the trigonometric equation
2cos2 x - 5cos x + 2 = 0?

A) 240 degrees
B) 135 degrees
C) 270 degrees
D) 90 degrees

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