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  • Utilizator Brainly
2014-03-29T18:17:17+02:00
Sinα+cosα=1/3 ⇒ (sinα+cosα)²=sin²α+cos²α+2sinαcosα=1/9;
sin²α+cos²α=1;
sin2α=2sinαcosα ⇒ sin2α=1/9-1=-8/9
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