So I'm doing a project on Rose Curves and have a formula I can't quite prove. I have that for r=acos(kx)+b if k is divisible by 4 then the curve intercepts the X and y axes. However if b not equal to 0, then the graph of r=acos(kx)+b does not cross the y axis if k is not divisible by 4. I'm having trouble proving this second part
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