DHS - 5.2
№1.15. Prove that the function f (x) = cos7x - cosx; φ (x) = 2x2 as x → 0 are the infinitesimal of the same order of smallness.
Find №2.15 limits.
№3.15 investigate these functions continuity and build their schedules.
№4.15 investigate these functions continuity at these points. f (x) = ....; x1 = 0; x2 = 1.

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