C;972 x^6-8424 x^5 y+1944 x^5+20520 x^4 y^2-4320 x^4 y-1332 x^4-23220 x^3 y^3-3600 x^3 y^2+12456 x^3 y-2816 x^3+14355 x^2 y^4+14760 x^2 y^3-27768 x^2 y^2+11136 x^2 y-1344 x^2-4374 x y^5-14370 x y^4+26724 x y^3-15552 x y^2+3936 x y-384 x+503 y^6+5412 y^5-11337 y^4+9088 y^3-3696 y^2+768 y-64=0            の双対曲線 C^\[FivePointedStar] を多様な発想で求め; その二重接線達を求めて下さい