simplify (3x - 5y)^2 + (3x + 5y)^2
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= (3x)²+(5y)²-2*3x*5y+(3x)²+(5y)²+2*3x*5y
= 9x²+25y²-30xy+9x²+25y²+30xy
= 18x²+50y²
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