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Sagot :

(2t+1)²+4t²-1
=
(2t+1)(2t+1)+(2t+1)(2t-1)
=(2t+1)(2t+1+2t-1)
=4t(2t+1)
(2t+1)²+4t²-1
=
(2t+1)(2t+1)+(2t+1)(2t-1)
=(2t+1)(2t+1+2t-1)
=4t(2t+1)

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