Вариант 6 ИДЗ 5.2

EDS - 5.2
№1.6 Prove that the functions f (x) = 1 - cos4x; φ (x) = 6x2 as x → 0 are infinitesimal of the same order of smallness.
№2.6 Find the limits.
№3.6 Investigate these functions for continuity and build their graphs.
№4.6 Investigate these functions for continuity at the specified points. f (x) = ....; x1 = 0; x2 = 2;