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critical points are those where the derivative vanishes

f'(x)=0

or the derivative does not exist

so it means that c=0 is one critical value,coz derivative is not defined there

but do mind one thing,function should be defined at the critical value

so what do you think the solution here , is have any critical value ?

what function is actually given in this prob,u posted the derivative

f(x)=9/x+x
is the funtion