Find the sum of
![6 {x}^{2} + 5xy + {y}^{2} \\ {x}^{2} - 5xy - {y}^{2} \\ - 4 {x }^{2} - 3 {y}^{2} 6 {x}^{2} + 5xy + {y}^{2} \\ {x}^{2} - 5xy - {y}^{2} \\ - 4 {x }^{2} - 3 {y}^{2}](https://tex.z-dn.net/?f=6+%7Bx%7D%5E%7B2%7D++%2B+5xy+%2B++%7By%7D%5E%7B2%7D++%5C%5C++%7Bx%7D%5E%7B2%7D+-+5xy+-++%7By%7D%5E%7B2%7D+++%5C%5C++-+4+%7Bx+%7D%5E%7B2%7D++-+3+%7By%7D%5E%7B2%7D+)
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hope it will help you dear
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