Рябушко А.П. ИДЗ 5.2 вариант 30

DHS - 5.2
№1.30 Prove that the function f (x) = cos 3x - cos5x; φ (x) = x2, as x → 0 are the infinitesimal of the same order of smallness.
№2.30 Find limits.
№3.30 investigate these functions continuity and build their schedules.
№4.30 investigate these functions continuity at these points. f (x) = (x + 1) / (x-2); x1 = 2; x2 = 3;

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