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OpenStudy (anonymous):
All solutions in [0 - 2pi] for equation 2cos^2x-1=0 Thanks so much! :D
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OpenStudy (anonymous):
pi/4, 3pi/4, 5pi/4, 7pi/4
OpenStudy (anonymous):
also you can use 3pi/4 +- 2npi and 5pi/4 +- 2npi
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