решите неравенство f ' (x)<0, если f(x)=2cosX-x
-2sin x-1<0
sin x>-1/2
7pi/6 +2pi n<x< -pi/6 +2pin
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-2sin x-1<0
sin x>-1/2
7pi/6 +2pi n<x< -pi/6 +2pin