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A = x² - 64  différence de 2 carrés

B = 49 - 9 t²  

A=(x-8)(x+8)

B=(7-3t)(7+3t)

[tex]a = x ^{2} - 8 ^{2} [/tex]

[tex]a = x ^{2} - 64[/tex]

[tex]b = 7 ^{2} - (3t)^{2} [/tex]

[tex]b = 49 - 9t^{2} [/tex]

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