var x,y: real;
begin
write('Введите x: ');
readln(x);
y:=2*(1/tan(3*x))-(1)/(12*x*x+7*x-5);
write('y = ',y);
end.
var x,y: real;
begin
write('Введите x: ');
readln(x);
y:=2*(1/tan(3*x))-(1)/(12*x*x+7*x-5);
write('y = ',y);
end.