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OpenStudy (anonymous):
all solutions to the equation in the interval [0, 2π). cos (2x) - cos (x) = 0
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OpenStudy (anonymous):
you have to use the compound angle formula first
OpenStudy (anonymous):
which is cos(a-b) = cosacosb+sinasinb
OpenStudy (anonymous):
thanks, i think i got it. i got 0, 2pi/3, and 4pi/3
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