Question: Does plot() command have different behaviour in Maple 16 when using coords=polar?

I've observed different behaviour in Maple 16 when invoking the plot() command with the coords=polar option.

 

Here's what Maple 15 produces:

 

 

 

 

 

...and here is what I get in Maple 16:

Further, the result in Maple 16 depends on the order of the equations in the list:

 


Feature, or bug? 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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