$[$show the steps to get to the answer$]$

find the voltage v$\_($c$)($t$)$

v$\_($s$)($t$)-10$cos$(2$t$+10\backslash$deg $)$V

ANS: $,$Vc$=(4\mathrm{.}57+$j$1\mathrm{.}78)=4\mathrm{.}9<mn>2</mn><mn>1</mn><mn>.</mn><mn>3</mn><mi>\backslash </mi>$deg volts

v$\_($c$)($t$)=4\mathrm{.}9$cos$(2$t$+21\mathrm{.}3\backslash$deg $)$ volts