Answers

2015-08-18T13:43:12+05:30
x2=x+x+x+x+... (x  times)
[12=1;22=2+2;32=3+3+3 and so on]

Differentiating this equation wrt x, we get
2x=1+1+1+1+... (x times)
2x=x
2=1
0
I've already read this somewhere
we solved it in our school this way so i thought to tell you this thing
OK thanks
welcome