plot(y_,x_,xmin_,xmax_, ymin_,ymax_) := plot(y_,x_, xmin_,xmax_,ymin_,ymax_,100);
plot(y_,x_,xmin_,xmax_) := plot(y_,x_, xmin_,xmax_,(-10),10,100);
plot(y_,x_) := plot(y_,x_, (-10),10,(-10),10,100);
plot(y_=p_, x_):= plot(p_,x_, (-10),10,(-10),10,100);
plot(y_) := plot(y_,x);