Calculati u·v daca |u|=7 |v|=8  si masura unghiului dintre vectori este 15 grade

Răspunsul a fost dat de: USER6162
2 September 2025 matematica 5 minute
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Clasă: Education Materie: matematica
Calculati u·v daca |u|=7 |v|=8  si masura unghiului dintre vectori este 15 grade
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u * v = |v| * |u| * cos 15 grade
cos 15 = cos(45-30)=cos45cos30+sin45sin30=radical 2/2 * radical din 3/2 + 1/2 * radical din 3/2 = √6 + √2 totul supra 4
u * v = 7 * 8 * (√6+√2)/4 = 14 * (√6+√2)
Răspunsul a fost dat în data 2 September 2025

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