When X - >, the following infinitesimal equivalent to X is? A 3x B SiNx C ln (1 + x ^ 2) d x + SiNx

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• 1. When x → 0, which of the following functions is not the equivalent infinitesimal of arctanx
• 2. When x approaches 0, A.E ^ x b.sin 1 / (1 + x) c.ln (2 + x) is infinitesimal When x approaches zero, the following variables are infinitesimal A.e^x B.sin 1／（1+x） C.ln（2+x） D.1-cosx
• 3. When 3 π
• 4. Infinitesimal equivalence problem: X → 0, the following infinitesimal equivalent to e ^ 2x-1 is: A. x B. 2x C. 4x D. x ^ 2 seeking process
• 5. Find the equivalent infinitesimal of (1 + 2x) ^ 1 / 2 - (1 + 3x) ^ 1 / 3 (x - > 0) Expressed as a power function of X
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• 7. LIM (x tends to 3) 3 / (x ^ 2-6x + 9)
• 8. Let LIM (x approach to 0) (e ^ X - (x ^ 2 + ax + b)) / X be equal to 2, and find the value of a and B
• 9. Finding the limit LIM (x tends to a) [e ^ (x-a) - 1] / (x-a)
• 10. Finding the limit LIM (x - > 0) ln (1 + x) - X / x ^ 2
• 11. 4. When x → + ∞, an infinite number of the following variables is a.b.ln (1 + x) c.sinx d.e-x
• 12. When x → + ∞, which of the following is infinitesimal: ln (1 + x), SiNx / x, X ＾ 2 / x + 1, e ＾ (- 1 / X ＾ 2)
• 13. limx→0（x^3＋1）/（x＋1）sin2x
• 14. What is the limit of sin2x / x?
• 15. Let f (x) have a function of second order, and f '' (x) > 0, limx tends to 0f (x) / x = 1. It is proved that when x > 0, f (x) > X
• 16. If f '(0) = 1, then limx → 0f (x) - f (- x) / X=
• 17. Let f (x) be differentiable at x = 0 and f (0) = 0, then limx tends to 0, f (x) / x =?
• 18. Is E2x power + 1 equivalent infinitesimal 2x or 2x + 2
• 19. When x approaches 0, what order of infinitesimal is x ^ 2-sinx!
• 20. What order of infinitesimal and high number is X-1