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(α-β)^2=α^2-2α+β^2ですよね？
(α+β)^2=a^2+2αβ+β^2から-4αβを引かないと
-2αβにならなくて、等号が成り立たないからです
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(α-β)^2=α^2-2α+β^2ですよね？
(α+β)^2=a^2+2αβ+β^2から-4αβを引かないと
-2αβにならなくて、等号が成り立たないからです
Users viewing this question
are also looking at these questions 😉
