What is the derivative of the function$()=/2$tan$$f$($x$)=$ex$/2$tanxx$?$

Select one:

a$.$

$(/22$sec$2)(/2$tan$)2($ex$/22$sec$2$x$)($ex$/2$tanx$)$x$2$

b$.$

$(/22$sec$2)+(/2$tan$)2($ex$/22$sec$2$x$)$x$+($ex$/2$tanx$)$x$2$

c$.$

$(/2$sin$2)(/2$tan$)2($ex$/2$sin$2$x$)$x$($ex$/2$tanx$)$x$2$

d$.$

$(/22$sec$2)(/2$tan$)2$