$\"\"$

The polar equation is $\"\"$ .

Since polar equation is a cosine function, it is symmetric with respect to the polar axis.

Construct a table and calculate the values of $\"\"$ on $\"\"$ .

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\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \

$\"\"$	$\"\"$	$\"\"$	$\"\"$	$\"\"$	$\"\"$
$\"\"$	$\"\"$	$\"\"$	$\"\"$	$\"\"$	$\"\"$

$\"\"$

Graph :

1. Draw a polarcoordinate plane.

2. Use the points and polar axis symmetry to sketch the curve.

$\"\"$

Graph of the polar equation $\"\"$ :

$\"\"$