Calculate the gravity in m$/$s$^2$ at the equator, $45\backslash$deg latitude, and North Pole using the GRS$80$ gravity equation shown below. $7=978032\mathrm{.}7(1+0\mathrm{.}0053024$ sin$^2-0\mathrm{.}0000058$ sin$^22$p$),$ where $978032\mathrm{.}7$ is mgal