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and is (x'2+y'2)-(a'2-b'2)
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=(x²+y²+2xy)-(a²+b²-2ab)
=(x+y)²-(a-b)²
=(x+y+a-b)(x+y-a+b). formula=>a²-b²=(a+b)(a-b)
=(x+y)²-(a-b)²
=(x+y+a-b)(x+y-a+b). formula=>a²-b²=(a+b)(a-b)
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