]you are in charge of erecting a radio telescope on a newly discovered planet. to minimize interference, you want to place it where the magnetic field on the planet is the weakest. the planet is spherical, with a radius of 6 units. based on a coordinate system whose origin is at the center of the planet, the strength of the magnetic field is given by m (x, y, z) = 6 x − y 2 + xz + 60 . use the method of lagrange multipliers to determine where you should locate the telescope.