DHS - 5.2
№1.26 Prove that the function f (x) = cos x - cos3 x; φ (x) = 6x2 as x → 0 are the infinitesimal of the same order of smallness.
№2.26 Find limits.
№3.26 investigate these functions continuity and build their schedules.
№4.26 investigate these functions continuity at these points. f (x) = (x + 5) / (x-3); x1 = 3; x2 = 4;

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