Найдите множества значений функции1) y=7cosx+5

2) y=2-4cos^2x

3) y=4sinx-9

y=9-2sin^x

С решением

1) E (cosx) = [-1; 1]; E (7cosx) = [-7; 7]; E (7cosx+5) = [-2; 13]

2) E (cosx) = [-1; 1]; E (cos^2x) = [0; 1]; E (4cos^2x) = [0; 4]; E (2-4cos^2x) = [-2; 2]

3) E (sinx) = [-1; 1]; E (4sinx) = [-4; 4]; E (4sinx-9) = [-13; -5]

4) E (sinx) = [-1; 1]; E (sin^2x) = [0; 1]; E (2sin^2x) = [0; 2]; E (9-2cos^2x) = [7; 9]