Chapter 14, Problem 56P

For the system in Fig. 14.83 find the sinusoidal expression for the unknown current $i_1$ if $\begin{array}{l}{i}_s=20\times 10{-}^6\sin (wt+{60}^{\circ })\\ i_2=6\times 10{-}^6\sin (wt+{30}^{\circ })\end{array}$

Fig. 14.83