7.求下列函数的导数:-|||-(1) =arcsin (1-2x) ;-|||-(2) =dfrac (1)(sqrt {1-{x)^2}} ;-|||-(3) =(e)^-dfrac (x{2)}cos 3x ;-|||-(4) =arccos dfrac (1)(x) =-|||-(5) =dfrac (1-ln x)(1+ln x) =-|||-(6) =dfrac (sin 2x)(x) =-|||-(7) =arcsin sqrt (x) ;-|||-(8) =ln (x+sqrt ({a)^2+(x)^2}) =-|||-(9) =ln (sec x+tan x)-|||-(10) =ln (csc x-cot x)