Write h as a composition of two functions f and g: a$)$ h$($x$)=$log$($x$^2+1)$ b$)$ h$($x$)=($sin X$)^2$ c$)$h$($x$)=($cos x$^3,$ sin x$^3)$ d$)$h$($x$,$y$)=($x$^2$y$)^3+$x$^2$y