A certain radar system uses linear frequency modulated waveforms of the form

\[
x(t)=\operatorname{Rec} t\left(\frac{t}{\tau}ight) \cos \left(\omega_{0} t+\mu \frac{t^{2}}{2}ight)
\]

What are the quadrature components? Give an expression for both the modulation and instantaneous frequencies.