Lösning 1.9.1.a
Förberedande kurs i matematik
(Skillnad mellan versioner)
(Ny sida: <math> (x+y)^2-(x-y)^2 = x^2 + 2xy+y^2-x^2+2xy-y^2 = 4xy </math>) |
(Ny sida: <math> (x+y)^2-(x-y)^2 = x^2 + 2xy+y^2-x^2+2xy-y^2 = 4xy </math>) |
Nuvarande version
\displaystyle (x+y)^2-(x-y)^2 = x^2 + 2xy+y^2-x^2+2xy-y^2 = 4xy
