If f (x) has a limit at x = x0, then f (x) is differentiable at x = x0 A. Wrong B. Right y=x^n+e^x,y^(n)=n!+e^x A. Wrong B. Right If x of function y = LNX changes from 1 to 100, then the increment of independent variable x is DX = 99 and the increment of function dy = ln100 A. Wrong B. Right The 4N derivative of the function y = cos2x is cos2x A. Wrong B. Right When x approaches negative infinity, SiNx / X is infinitesimal A. Wrong B. Right

1 A, the existence of limit is not necessarily continuous, even if it is continuous, it is not necessarily differentiable (for example, where y = | x |, x = 0)
2 B
3 B Dy=ln100-ln1=ln100.
Its derivative is 2 ^ 4ncos2x
5 B

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