(本题满分8分)设(x)=dfrac (1)(pi x)+dfrac (1)(sin pi x)-dfrac (1)(pi (1-x)) ,in [ dfrac (1)(2),1).-|||-__试补充定义f(1)使得f(x)在(x)=dfrac (1)(pi x)+dfrac (1)(sin pi x)-dfrac (1)(pi (1-x)) ,in [ dfrac (1)(2),1).-|||-__上连续..