t $=$ linspace$(0,2,201)$; v$0=20$; th$0=45$; $[$x$,$y$]=$trajectory$($t$,$v$0,$th$0)$;plot$($x$,$y$,\text{'}$b$\text{'})$; xlabel$(\text{'}$x$\text{'})$; ylabel$(\text{'}$y$\text{'})$;