Помогите пожалуйста. Срочно надо .Найдите множество значений функции у=3cos^2x-1
-1<=cosx<=1
0<=cos^2x<=1
0<=3cos^2x<=3
-1<=3cos^2x-1<=2
Ответ: [-1; 2]
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-1<=cosx<=1
0<=cos^2x<=1
0<=3cos^2x<=3
-1<=3cos^2x-1<=2
Ответ: [-1; 2]