在下列各题中,确定函数关系式中所含的参数,使函数满足所给的初值-|||-条件:-|||-(1) ^2-(y)^2=C |x=0=5;-|||-(2) =((C)_(1)+(C)_(2)x)(e)^2x, |x=0=0,y'|=0=1;-|||-(3) =(C)_(1)sin (x-(C)_(2)) |x=pi =1, '|x=pi =0.