Resolver la identidad trigonométrica
(sen x + cos x)² + (sen x - cos x)² = 2
(sen x + cos x)² + (sen x - cos x)² = 2
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sen²x+2senxcosx+cos²x + sen²x-2senxcosx+cos²x=2
sen²x+cos²x + 2senxcosx-2senxcosx + sen²x+cos²x=2
identidad pitagorica sen²x+cos²x=1
1 + 0 + 1= 2
2 = 2