If the function is F(x)=3*X*X, the domain is X >；; = 0, the derivative of x at X=0 does not exist!

Because the actual domain of F(x)=3*X*X is R, if we discuss it in R, there will be a derivative at X=0.

If F(x)=3*X*X, let the domain be X & gt=0, and the derivative at X=0 certainly does not exist.

This can only say that the right derivative of F(x) exists.

Okay？ Solve?

I'm also reviewing for the postgraduate entrance examination, and I can read faster than you, hehe ~ ~ ~