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Sagot :

B = (4x² + 5) (x² + 1) = 4x⁴ + 4x² + 5x² + 5 = 4x⁴ + 9x² + 5

C = (2x² + 3) (6x² + 5) = 12x⁴ + 10x² + 18x² + 15 = 12x⁴ + 28x² + 15

Bonne soirée.

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