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expand (x+2x² + 3x³ + 4x⁴ + 5x⁵ + 6x⁶ + 7x⁷ + 8x⁸ + 9x⁹ + 10x¹⁰ )^2
expand (x+2x² + 3x³ + 4x⁴ + 5x⁵ + 6x⁶ + 7x⁷ + 8x⁸ + 9x⁹ + 10x¹⁰ )^2
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