Imagine you are located in the northern hemisphere and see a star directly overhead (zenith). in what direction will you have to look to see this star set?

The answer is : This star will never set. Circumpolar stars stay above the horizon all hours of the day, every day of the year. They neither rise nor set but always remain in the sky. They’re up even in daytime when you can’t see them.

reflecting point a across the origin negates both of its coordinates.

b = (5, -4)