Calculus - Application of Differentiation (7 of 60) Max/Min Values: Ex. 6 f(x)=cos^2(x)

In this video I will find max/min, where f(x) is increasing/decreasing of f(x)=x/(x^2+2).

[mattfly]

where do you get the x values ( x = pie/2 and the other 2 ones ) ?