The audio clip is scrambled using the following encryption process.

The audio clip $($unscrambled audio signal$)$ is stored in vector Z$.$

The first half of the elements in $Z$ are multiplied by $cos(\frac{7n}{9}),$ where $n$ is an integer number starting from $n=1.$ The result is stored in a vector named $Z1.$

The second half of the elements in $Z$ are multiplied by $sin(\frac{3mn}{11}),$ where $n$ is an integer number starting from $n=1.$ The result is stored in a vector named $22.$

Anew complex$-$valued signal, P$,$ is created, where the real part of $P$ is equal to Z$1,$ and the imaginary part of $P$ is equal to $Z2.$

The final vector, $x,$ is constructed using P$.$ The real part of $x$ is equal to the phase of $P$ and the imaginary part of $x$ is equal to the magnitude of $P.$

Ximat is given to you.

Only use matrix$/$vector manipulations to recover the audio clip, $Z.$