$(6)[20$ pts$]$ Calculate the derivative of the following functions. You do NOT need

to expand out your answer.

$($a$)$ y $=10$ sin $($x$)4/(3$x$^5+7)$

$($b$)$ y $=4$x$^3+15$x$^2+7$

$($c$)$ y $=5$e$^9$x$^4+6$x$^3$

$($d$)$ y $=$ ln$(5$x$2$ tan x$)$