Let `f(x)=(1-x(1+|1-x|))/(|1-x|)cos(1/(1-x))` for `x!=1 `, Then:, (A)`(lim)_(n->1^-)f(x)`, does not exist, (B)`(lim)_(n->1^+)f(x)`, does not exist, (C)`(lim)_(n->1^-)f(x)=0`,