Réponses

2013-11-11T16:33:39+01:00
(2t+1)²+4t²-1
=
(2t+1)(2t+1)+(2t+1)(2t-1)
=(2t+1)(2t+1+2t-1)
=4t(2t+1)
2013-11-11T16:34:00+01:00
(2t+1)²+4t²-1
=
(2t+1)(2t+1)+(2t+1)(2t-1)
=(2t+1)(2t+1+2t-1)
=4t(2t+1)