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Sagot :

VINS

bonsoir

( 3 ⁿ - 3 ⁻ⁿ )² - ( 3 ⁿ + 3 ⁻ⁿ )²

 9 n - 2 + 1 /9 ⁿ - ( 9 ⁿ + 2 + 1 /9 ⁿ )

=  9 n - 2 + 1 /9 ⁿ - 9 ⁿ - 2 - 1 /9 ⁿ

= -  4

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