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nadjafova91
@nadjafova91
July 2022
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пусть даны два вектора a(2;2;-1) и b(4;-3;0). Найдите синус угла между этими векторами.
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sedinalana
Cosa=(2*4-2*3-1*0)/√(4+4+1)*√(16+9+0)=2/√9*√5=2/(3*5)=2/15
sina=√(1-cos²a)=√(1-4/225)=√(221/225)=√221/15
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Answers & Comments
sina=√(1-cos²a)=√(1-4/225)=√(221/225)=√221/15