What is the expression for v

$?$

v$=196$cos$(3000\backslash$pi t$67\mathrm{.}5)$V

v$=196$cos$(1500\backslash$pi t$+67\mathrm{.}5)$V

v$=196$sin$(9000\backslash$pi t$67\mathrm{.}5)$V

v$=196$sin$(6000\backslash$pi t$+67\mathrm{.}5)$V