Option 25 DHS 5.2

If the total amount of your purchases from the seller Chelovek10000 more than:
- 1836 ₽ the discount is 10%
- 918 ₽ the discount is 5%
- 459 ₽ the discount is 3%

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EDS - 5.2
№1.25 Prove that the functions f (x) = sin (x2 + 5x); φ (x) = x3 - 25x as x → 0 are infinitesimal of the same order of smallness.
№2.25 Find the limits.
№3.25 Investigate these functions for continuity and build their graphs.
№4.25 Investigate these functions for continuity at the specified points. f (x) = (x- 4) / (x + 3); x1 = -3; x2 = -2.