Question
If $\vec{a}$ and $\vec{b}$ are unit vectors inclined to the x-axis at angles $30^\circ$ and $120^\circ$, respectively, then $|\vec{a} + \vec{b}|$ equals
If $\vec{a}$ and $\vec{b}$ are unit vectors inclined to the x-axis at angles $30^\circ$ and $120^\circ$, respectively, then $|\vec{a} + \vec{b}|$ equals