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x^4-8 x^3 y-4 x^3+4 x^2 y^2+27 x^2 y+3 x^2 -8 x y^2-8 x y-4 y^3+16 y^2-12 y=0 の二重接線を 多様な発想で 求めて下さい^(2021)； ↓の手法をも用いて　提示願います: https://math.stackexchange.com/questions/3436714/algorithm-to-find-common-tangent-to-any-two-conics https://math.stackexchange.com/questions/2428815/the-common-tangent-of-two-tilted-parabolas?rq=1