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OpenStudy (anonymous):
Solve the following inequality. Express the exact answer in interval notation, restricting your attention to 0 ≤ x ≤ 2π. cos(2x) ≤ 0
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OpenStudy (anonymous):
cos(2x) ≤ 0 < ===> pi/2< 2x < pi ==> pi/4<x<pi/2
OpenStudy (anonymous):
or
OpenStudy (anonymous):
pi<2x<3pi/2 ==> pi/2<x<2pi/4
myininaya (myininaya):
http://openstudy.com/users/lilon88#/users/lilon88/updates/4e6cf1b00b8b4a2b95e0d377
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