Find the Angle Between the Vectors $\mathbf { u }$ And $\mathbf { v }$

Find the angle between the vectors $\mathbf { u }$ and $\mathbf { v }$ .
$$\mathbf { u } = \cos \left( \frac { \pi } { 3 } \right) \mathbf { i } + \sin \left( \frac { \pi } { 3 } \right) \mathbf { j } , \quad \mathbf { v } = \cos \left( \frac { 5 \pi } { 4 } \right) \mathbf { i } + \sin \left( \frac { 5 \pi } { 4 } \right) \mathbf { j }$$

A) $75 ^ { \circ }$
B) $105 ^ { \circ }$
C) $165 ^ { \circ }$
D) $175 ^ { \circ }$