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— we are metamorphosing!

臆病羊 科学というフィルムに取り憑かれて 神を忘れ いつの間にか迷宮に迷い込んだ TW: v0mit, blood, s...

Why is (n-1)(n+1)=n^2-1?

The basic answer is that you cross-multiply the values in each factor: (n - 1)(n + 1) n^2 - n + n -...