find the value of : (x+3y)2 + (x-3y)2
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We know, (a + b)² + (a - b)² = 2(a² + b²)
Hence, Here
2(x² + 9y²)
2x² + 18y²
Hence, Here
2(x² + 9y²)
2x² + 18y²
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