DHS - 5.2
№1.20 Prove that the function f (x) = sin7x + sinx; φ (x) = 4x as x → 0 are the infinitesimal of the same order of smallness.
№2.20 Find limits.
№3.20 investigate these functions continuity and build their schedules.
№4.20 investigate these functions continuity at these points. f (x) = ....; x1 = -2; x2 = -1.

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