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3 years, 12 months ago
2 years, 6 months ago
(a+b-c+d)²-(a-b+c-d)²=
a+b-c+d+a-b+c-d=2a
a+b-c+d-a+b-c+d=2b-2c+2d
4a(b-c+d)
3 years, 11 months ago
let x=b-c+d
Then,
(a+b-c+d)² - (a-b+c-d)²
=(a+x)² - (a-x)²
=4ax
=4a(b-c+d)
=4ab-4ac+4ad
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