임송찬_세점을 지나는 곡선

(x-x(B))(x-x(C))/((x(A)-x(B))(x(A)-x(C)))y(A)+(x-x(A))(x-x(C))/((x(B)-x(A))(x(B)-x(C)))y(B)+(x-x(A))(x-x(B))/((x(C)-x(A))(x(C)-x(B)))y(C)_임송찬

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