Express the following complex numbers in the rectangular (x+ jy} form: \text { (a) } \quad(1+j)^{2}+(1+j)^{4} \text { (b) } \frac{(1-j \sqrt{3})^{2}}{(j-1)^{38}} \text { (c) }\left(\frac{2 j}{(j+\sqrt{3})}\right)^{19}