Use the linspace command or the colon operator : to create a vector t with entries

$2,2\mathrm{.}1,2\mathrm{.}2,...,10,$ and define the function y $=$ et$/15$ cos$(2$t$)$

$0\mathrm{.}2$t$2+4($make sure you use $$;$$ to suppress the

output for both t and y$)$