Polar and spherical plots (13 graphics)
Polar plots of the function . For it is an exact circle.
Staggered polar plots of the function . increases vertically from 1 to 6.
Spherical plot of the functions and . The coloring is according to and .
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. For 
it is an exact circle.
. 
increases vertically from 1 to 6.
and 
. The coloring is according to 
and 
.
