Chapter 10.2, Problem 4ES

Find the rectangular coordinates of the points whose polar coordinates are given.

$\begin{array}{l}\left(\text{a}\right)\left(-2,\pi /4\right)\\ \left(\text{b}\right)\left(6,-\pi /4\right)\\ \left(\text{c}\right)\left(4,9\pi /4\right)\\ \left(\text{d}\right)\left(3,0\right)\\ \left(\text{e}\right)\left(-4,-3\pi /2\right)\\ \left(\text{f}\right)\left(0,3\pi \right)\end{array}$