Question

o angulo entre os vetores U= (1,1,4) e V= (-1,2,2).

Answer 1

$\cos \theta=\dfrac{u\cdot v}{||u||\cdot||v||}\\\\\cos \theta=\dfrac{(1,1,4)\cdot (-1,2,2)}{||(1,1,4)||\cdot||(-1,2,2)||}=\dfrac{-1+2+8}{(\sqrt{18})(\sqrt{9})}=\dfrac{9}{\sqrt{162}}=\dfrac{\sqrt2}{2}\\\\\theta=45^\circ$