Вариант 2 ИДЗ 5.2

EDS - 5.2
№1.2. Prove that the functions f (x) = 1 - cos x; φ (x) = 3x2 as x → 0 are infinitesimal of the same order of smallness.
№2.2 Find the limits.
№ 3.2 Investigate these functions for continuity and build their graphs.
No. 4.2 Investigate these functions for continuity at the specified points. f (x) = ....; x1 = 3; x2 = 4.