^(sgnifica elevado)
Ola Rafaela
(cosx - senx)² = cosx² + sen²x - 2cosxsenx = 1 - 2cosxsenx
(cosx + senx)² = cos²x + sen²x + 2cosxsenx = 1 + 2cosxsenx
1 - 2cosxsenx = 2 - 1 - 2cosxsenx
1 = 2 - 1 = 1
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Ola Rafaela
(cosx - senx)² = cosx² + sen²x - 2cosxsenx = 1 - 2cosxsenx
(cosx + senx)² = cos²x + sen²x + 2cosxsenx = 1 + 2cosxsenx
1 - 2cosxsenx = 2 - 1 - 2cosxsenx
1 = 2 - 1 = 1
pronto