(x square + y square ) (x square - y square) - (x square -y square ) whole square =2(x square y square -y raise to the power 4)
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(a²-b²)²+(a²+b²)²
=>Expanding both of them we get,
(a⁴+b⁴-2a²b²) + (a⁴+b⁴+2a²b²)
Hence, on opening the brackets...
It gives, 2(a⁴+b⁴)
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