(x²+y²)(x²-y²)-(x²-y²)² =2(x²y²+y^4)
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(x²+y²)(x² - y²) -(x²-y²)² = 2( x²y² +y⁴)
x⁴ - y⁴ -(x⁴ -2 x²y²+y⁴) = 2 x²y² + 2 y⁴
x⁴ - y⁴ -x⁴ + 2 x²y² + y⁴ -2 x²y² - 2 y⁴ = 0
-2 y⁴ = 0
y = 0
Muthu2004:
is this correct
r we should find x also
answer should be 0=0
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