Mistake in lecture?

Video: What is a derivative?

I believe in the last example here the value of w circled in red should be 2.001 and not 1/2.001. or maybe he wanted to say J(w) and wrote w instead? In any case, this might need a correction i think. please correct me if i am wrong.

Yes, he meant to write and say J(w) there, not w.
I’ll submit an issue for the course staff.

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