Answer
$(-3, 1 + \pi)(3, 1+2\pi)$
See graph below
Work Step by Step
Given $(3, 1)$
$1$ is in the first quadrant plotted at 1 radian
See the graph below.
For different polar coordinates, it can be accomplished by the following:
$(−r,θ+π)=(-3, 1+π)=(-3, 1 + \pi)$
or
$(r,θ+2π)=(3, 1 + 2π)=(3, 1+2\pi)$
