square + 2 square + 3 square + 2 square is equal to 35 so what is the value of 2 square + b square + c square to 20 square
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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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