[(x²+y²)-(x-y)²+2y(x-y)]÷1/2
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[(x²+y²)-(x-y)²+2y(x-y)]÷1/2
[(x²+y²)-(x-y)²+2y(x-y)]÷1/2
[(x²+y²)-(x-y)²+2y(x-y)]÷1/2
[(x²+y²)-(x-y)²+2y(x-y)]÷1/2
[(x²+y²)-(x-y)²+2y(x-y)]÷1/2
[(x²+y²)-(x-y)²+2y(x-y)]÷1/2