bonjour
A = ( x - 4) ( x + 4)
B = ( 1 - y) ( 1 + y)
C = ( 10 x - 3) ( 10 x + 3)
D = ( 6 - 9 z) (6 + 9 z)
E = ( 2 pi - 5) ( 2pi + 5)
F = ( t + 3 - 4) ( t + 3 + 4) = ( t - 1) ( t + 7)
G = ( 2 x + 1 - 5) ( 2 x + 1 + 5) = ( 2 x - 4) ( 2 x + 6)
H = ( 3 i + 7 + i + 5) ( 3 i + 7 - i - 5) = ( 4 i + 12) ( 2 i + 2)
