-1 <= cos x <= 1 |-1
-1-1 <= cos x - 1 <= 1-1
-2 <= cos x - 1 <= 0
E(y): [-2; 0]
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-1 <= cos x <= 1 |-1
-1-1 <= cos x - 1 <= 1-1
-2 <= cos x - 1 <= 0
E(y): [-2; 0]