Ответ:
1-2cosx>0,
-2cosx>-1,
cosx<(1/2),
x<arccos(1/2),
π/3+2πn<x<5π/3+2πn
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Answers & Comments
Ответ:
1-2cosx>0,
-2cosx>-1,
cosx<(1/2),
x<arccos(1/2),
π/3+2πn<x<5π/3+2πn