Ответы на вопрос:
y = 1-cosx
cosx: [-1; 1], e(y): [0; 2]
y = 1 - 4cos2x
cos2x: [-1; 1], e(y): [-3; 5]
y = (1/2) sinx*cosx - 1 = (sin2x)/4 -1
sin2x: [-1; 1], e(y): [(-5/4); (-3/4)]
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