Determine the point$($s$)($If any$)$ at which the graph of the function has a horizontal tangent line.

$y=\sqrt[\phantom{2}]{3}x2cos(x),0x<mn>2</mn><mi></mi>$

STEP $1$: Find a derivative $y.$

STEP $2$ I Set $y=0$ and solve for $x.$

$x_1=$

$x_2=$

STEP $3$: Find the $y$ values by substituting the values from Step $2$ into the original function, $y_1$ cerresponds to $x_1$ and $y_2$ corresponds to $x_2,$ List the points where the function has horisontal tangent lines. Submit your answers in terms of piffor $.$