레딧에서 좋은 걸 배웠다



1-(1-x^2)*(1-y^2)


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1-(1-(2x-1)^2)*(1-(2y-1)^2)


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무난하게 전자 공식을 응용해 만들어봄


참고로 저거 어떻게 나온지 궁금하다면

댓링으로 달겠음