ok siddhant if u say it is right only 4 x=o
what can u say 4 this
x2 can b written as
x+x+x+x+x+x+.......(x times)
After differenciating this can also be written as
1+1+1+1+1+1+1+.... (x times)+
1+1+1+1+1+1+1+.....(x times)+
1+1+1+1+1+1+1+.....(x times)
the above whole thing x times
now differenciate u will get
0+0+0+0+0+0+0+0+.....(x times)
therefore d/dx of x2 is 0