Answer
Symmetric about the y-axis.
No symmetry about the x-axis.
No symmetry about the origin.
Work Step by Step
Testing for symmetry across the x-axis:
1. replace $\theta $ with $-\theta$ and see that we arrive at an equivalent equation.
$ r=1-\sin(-\theta)\qquad$ ... sine is an odd function,
$r=1+\sin\theta\qquad $... not equivalent.
2. replace $\theta $ with $\pi-\theta$ and $r$ with $-r ;$ see that we arrive at an equivalent equation
$-r=1-\sin(\pi-\theta)$
$-r=1-\sin\theta\qquad $... not equivalent.
Neither $(r, -\theta)$ nor $(-r, \pi-\theta)$ lie on the curve when $(r,\theta)$ lies on the curve.
No symmetry about the x-axis.
Testing for symmetry across the y-axis:
1. replace $\theta $ with $-\theta$ and $r$ with $-r;$ see that we arrive at an equivalent equation
$-r=1-\sin(-\theta)\qquad$ ... sine is an odd function,,
$-r=1+\sin\theta\qquad$ ... not equivalent.
2. replace $\theta $ with $\pi-\theta ;$ see that we arrive at an equivalent equation
$ r=1-\sin(\pi-\theta)\qquad$
$ r=1-\sin\theta\qquad$ ... equivalent - we have symmetry about y.
No symmetry about the origin, as it is not symmetric about both axes.
To graph, select a few values for $\theta$ and calculate $r.$
Use the symmetry.
See the resulting image.