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r = acos()
a > 0
circle
r = a(+-) asin()
a > 0
cardioid
r = acos4()
a > 0
rose
r = a(+-)b sin()
0<a<b
limacon with loop
r = asin3()
a > 0
rose
r = a(+-)bsin()
0<b<a
limacon without loop
Note 
Flashcard (127)