# d/dx [ sec ( - e^(sqrt(x))) ] #
# sec ( e^ (sqrt(x))) * tan ( e^ (sqrt(x))) * d/dx [ ( e^ (sqrt(x))) ] #
# sec ( e^ (sqrt(x))) * tan ( e^ (sqrt(x))) * e^ (sqrt(x)) * d/dx[ sqrt(x) ] #
# sec ( e^ (sqrt(x))) * tan ( e^ (sqrt(x))) * e^ (sqrt(x)) * 1/(2(sqrt(x)) #
# (sec ( e^ (sqrt(x))) * tan ( e^ (sqrt(x))) * e^ (sqrt(x))) /(2(sqrt(x)) #