3.求下列函数的微分:-|||-(1) =dfrac (1)(x)+2sqrt (x) =-|||-(2) =xsin 2x ;-|||-(3) =dfrac (x)(sqrt {{x)^2+1}} =-|||-(4) =(ln )^2(1-x) ;-|||-(5) =(x)^2(e)^2x ;-|||-(6) =(e)^-xcos (3-x) ;-|||-(7) =arcsin sqrt (1-{x)^2} :-|||-(8) =(tan )^2(1+2(x)^2) ;-|||-(9) =arctan dfrac (1-{x)^2}(1+{x)^2} =-|||-(10) =Asin (omega t+varphi )(A,omega ,varphi 是常数).