Найдите промежуток (промежутки) убывания функции: y=3x^2-9x-4
а) (-∞; -1 1/2] б) (-∞; 1 1/2] в) [1 1/2; +∞) г) [-1 1/2; +∞)
(Подробно пожалуйста) )))
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