3.求下列函数的导数或微分.-|||-(1) =ln sqrt (dfrac {2+3{x)^2}(3-sin 2x)} 求y"(0).-|||-(2) =(e)^-(sin ^2dfrac {1)(x)}+xsin [ tan (cos 2x)] , 求y`.-|||-(3)设 =((4x+{tan )^2x)}^dfrac (x{4x)} 求 |x=dfrac (pi )(4)