A tuning fork is held a certain distance from your ears and struck. Your eardrums' vibrations after t seconds are given by p equals 9 sine 3t .

A tuning fork is held a certain distance from your ears and struck. Your​ eardrums' vibrations after t seconds are given by . When a second tuning fork is​ struck, the formula describes the effects of the sound on the​ eardrums' vibrations. The total vibrations are given by . Complete parts ​(a)​-​(b).

Simplify​ p, the total​ vibrations, to a single term containing the sine