$y=tanx,y=0,x=\frac{}{4}$;$,$ about $x=\frac{}{2}$

$y=co{s}^{4}x,y=-co{s}^{4}x,-\frac{}{2}x\frac{}{2}$;$,$ about $x=$

$y=x,y=2\frac{x}{1+x^3}$;$,$ about $x=-1$

$x=\sqrt[\phantom{2}]{siny},0y,x=0$;$,$ about $y=4$

$x^2-y^2=7,x=4$;$,$ about $y=5$