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For the following exercises, determine whether the graphs of the polar equation are symmetric with respect to the `x`-axis, the `y`-axis, or the origin.

     `r^2 = 9 cos(7 theta)` 


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X
MathQuill
   x  x  √  n√  |   | (   ) π ∞ DNE
   x  √  (   ) π ∞ DNE
( ) ( ] [ ) [ ] —∞ ∞ ∪ DNE
< > ≤ ≥ or All Real Numbers DNE
log logn ln n√  | | e 
sin cos tan arcsin arccos arctan ⟨ ⟩
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