Suppose f$($x$)=($arcsin$1$x$)2.$f$($x$)=($arcsinx$1)2.$ Then f$($x$)=$f$($x$)=$

A$\mathrm{.}2$arcsin$1$xx$1$x$2$x$1$x$22$arcsinx$1$

B$.2$x$21$x$2$x$21$x$22$

C$.2$x$21$x$21$x$22$x$2$

D$.2$arcsin$1$xx$21(1$x$)2$x$21($x$1)22$arcsinx$1$

E$\mathrm{.}2$x$2$arcsin$1$x$11$x$21$x$21$x$22$arcsinx$1$