Expression 7: left parenthesis, "x" squared plus "y" squared minus 2 "a" "y" , right parenthesis squared equals 4 "a" squared left parenthesis, "x" squared plus "y" squared , right parenthesisx2+y2−2ay2=4a2x2+y2
7
Аналитическое уравнение кардиоиды (4)
8
Expression 9: left parenthesis, "x" squared plus "y" squared plus 2 "a" "y" , right parenthesis squared equals 4 "a" squared left parenthesis, "x" squared plus "y" squared , right parenthesisx2+y2+2ay2=4a2x2+y2