50 setxunit
7.5 setborder
-3 5 setxrange
-3 3 setyrange
jpegmode
/a 2 def
1 1 settkstep
.5 .5 setsubtkstep
2 2 setmkstep
traceaxes
axesarrow
/R {settvar
a 2 exp t div sqrt
} def
.1 50 settrange
gsave
1.75 setlinewidth
continu
orange
(R) courbepolar
grestore
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