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OpenStudy (anonymous):
find all solutions in the interval [0,2pi] for the equation 2cos^2 feta-1=0
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OpenStudy (anonymous):
cos^2 (theta) = 1/2 cos (theta) = 1/root2, -1/root2 theta = pi/4, 3pi/4, 5pi/4, 7pi/4
OpenStudy (anonymous):
thanks
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