Вариант 14 ИДЗ 5.2

EDS - 5.2
№1.14. Prove that the functions f (x) = sin 3x– sin x; φ (x) = 10x as x → 0 are infinitesimal of the same order of smallness.
№2.14 Find the limits.
№3.14 Investigate these functions for continuity and build their graphs.
№4.14 Investigate these functions for continuity at the specified points. f (x) = ....; x1 = 1; x2 = 2.