Question

Considere os vetores

Answer 1

Resposta:

$| \vec{c} + \vec{f}| = \sqrt{\vec{c^{2}} + \vec{f^{2}} + 2\vec{c} \vec{f} cos \phi } }\\| \vec{c} + \vec{f}| = \sqrt{10^{2} + 4^{2} + 2 \cdot 10 \cdot 4 \cdot cos 45^{o}}\\| \vec{c} + \vec{f}| \approx 13,11\\\\|\vec{c} - \vec{e}| = |10 - (-2)| = 12$