hasil dari (sin x - cos x )² + 2 cos x sin x =1

[tex]( sin \: {x}^{2} + cos \: {x}^{2} - 2 \sin(x) \cos(x) ) - 2 \sin(x) \cos(x) = 1[/tex]
[tex] { \sin(x) }^{2} + { \cos(x) }^{2} = 1[/tex]