factorise it and write it's identity
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by middle split it can be factorised
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(3x✓y)^2+(4y✓y)^2-2*3x✓y*4y✓y
so it become (3x✓y - 4y✓y)^2
it is in the form of (a-b)^2= a^2+b^2-2ab
so it become (3x✓y - 4y✓y)^2
it is in the form of (a-b)^2= a^2+b^2-2ab
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