What is the limit of cosx / X when x tends to zero?

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• 8. How to simplify SiNx ^ 4 + cosx ^ 2
• 9. Find the function y = 2sin2x + SiNx cosx when x belongs to the maximum and minimum values of brackets - π / 2 to π / 2
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• 11. What is the limit of cosx when x tends to zero? Ask for detailed explanation
• 12. What is the limit of cosx when x tends to infinity
• 13. X tends to π, (1 + cosx) / (x - π) ^ 2, find the limit
• 14. The limit of cosx when x tends to π / 2 By the way, we also find the limit of cosx when x tends to zero I just learned the limit, I don't know anything. It should be proved by the limit's ε - δ formula
• 15. Think about the problem, to know cosx + SiNx = 1, find the nth power of (cosx) + (SiNx)=
• 16. Let f (x) = (SiNx ^ 2 + 1), find the Taylor formula with Peano remainder of F (x) at x = 0, and find f (n) (0)
• 17. When x approaches zero, (1-cosx / 2) is a higher order infinitesimal of X?
• 18. When x → 0, (1-ax ^ 2) ^ (1 / 4) - 1 and xsinx are equivalent infinitesimals
• 19. If x tends to 0, (1-ax ^ 2) ^ 1 / 4 and xsinx are equivalent infinitesimals, find a
• 20. Let x → 0, etanx ex and xn be infinitesimals of the same order, then n is () A. 1B. 2C. 3D. 4