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A = 16 x² - 24 x + 9

B  = idem A

C = 9 x² - 64

D = idem C

E = 4 x² - 1 + 1 - 6 x + 9 x² =  13 x² - 6 x

F =  ( 2 x + 1 ) ( 2 x + 1 )² =  ( 2 x + 1 ) ( 4 x² + 4 x + 1 )

=  8 x ³ + 8 x + 2 x + 4 x² + 4 x + 1

= 8 x ³ + 4 x² + 14 x + 1

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