AOD

If at some point x for f(x) ,
f'(x)=0
But also f"(x)=0 at that point
Will we call it a critical point or not?

@NishantThakre basic condition for critical point is f’ (x)=0 or f’(x) not exist.

@ashishdeosingh
Please tell this
I read it in several books
It is conflicting
Some say condition is f'(x) should be zero and says nothing about f''(x) at that point
While some say f'(x) should be zero and f"(x) should be non zero for critical point

@sanketbiradar
I think you should say f'(x)=0 not f(x)=0

@nishantthakre
for critical point no such condition on f”.
f’ is zero or not existent at that point.