A system with the transfer function `(Y(s))/(X(s))` = `s/(s +p)` has an output y(t) = cos`(2t - pi/3)` for the input signal x(t) = P cos`(2t - pi/2)`. Then, the system parameter 'p' is
`sqrt(3)`
`2/sqrt(3)`
1
`sqrt(3)/2`
Just give me the answer