The first derivative of f is given by LaTeX: f'\left(x\right)=\frac{\cos^2x}{x}- \frac{1}{5}f ′ ( x ) = cos 2 ⁡ x x − 1 5. How many critical values does f have on the open interval LaTeX: \left(0,10\right)( 0 , 10 )? Enter an integer value and 0 if no critical values.