Question

x+x+.... x times = x × x
Differentiating both sides w.r.t. x,
d (x+x+... x times)/dx = d (x^2)/dx
1+1+... x times = 2x
x = 2x
1 = 2
What is wrong above in the steps that made 1 equals to 2 true?

Answer 1

You can't take the derivative of x+x+x+x... x times because 'x' here is not an integer so you don't know how many Times you have to take the derivative