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Question: plot ((1/2)*x*tan(log((1/5)*(2*(x^2+y^2)))) = y

Question:plot ((1/2)*x*tan(log((1/5)*(2*(x^2+y^2)))) = y

vitato 15 Maple 2016
plot implicitplot
December 23 2016
0

I want to plot the following equation

((1/2)*x*tan(log((1/5)*(2*(x^2+y^2)))) = y

I tried:

with(plots, implicitplot)

implicitplot((1/2)*x*tan(log((1/5)*(2*(x^2+y^2)))) = y, x = -5 .. 5, y =-5..5, numpoints = 1000, gridrefine = 6, color = red)

but result is strange... 

 
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