DHS - 5.2
№1.28 Prove that the function f (x) = 1 - cos 4x; φ (x) = x · sin 2x as x → 0 are the infinitesimal of the same order of smallness.
№2.28 Find limits.
№3.28 investigate these functions continuity and build their schedules.
№4.28 investigate these functions continuity at these points. f (x) = 4x / (x + 5); x1 = -5; x2 = -4;

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