题目2.求下列函数的导数:-|||-(1) =(x)^3+dfrac (7)({x)^4}-dfrac (2)(x)+12 ;-|||-(2) =5(x)^3-(2)^x+3(e)^x ;-|||-(3) =2tan x+sec x-1 ;-|||-(4) =sin xcos x ;-|||-(5) =(x)^2ln x ;-|||-(6) =3(e)^xcos x ;-|||-(7) =dfrac (ln x)(x) ;-|||-(8) =dfrac ({e)^x}({x)^2}+ln 3 ;-|||-(9) =(x)^2ln xcos x ;-|||-(10) =dfrac (1+sin t)(1+cos t)题目解答答案