0 <= arccos x <= π|+4π
4π <= arccosx+4π <= 5π
1/5π <= 1/arccosx+4π <= 1/4π
Ответ: E(y): [1/5π; 1/4π]
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0 <= arccos x <= π|+4π
4π <= arccosx+4π <= 5π
1/5π <= 1/arccosx+4π <= 1/4π
Ответ: E(y): [1/5π; 1/4π]