Question

critical numbers of f(x)=x-cosx for 0 12 years ago

Answer 1

http://en.wikipedia.org/wiki/Critical_point_(mathematics)

Answer 2

I think its pi/2?

Answer 3

f'(x)=1+sinx
for critical point, 1+sinx=0
=> sinx=-1.
=>x=3pi/2, since 0<x<2pi.