$\"\"$

The function is $\"\"$ .

Rewrite the above function as difference of two angle measures.

$\"\"$ . $\"\"$

Consider $\"\"$ .

Substitute $\"\"$ in above function. \ \

$\"\"$

Apply sine difference identity : $\"\"$ .

$\"\"$

Therefore, the pressure after 1 second is $\"\"$ pascals.

$\"\"$

a. The function $\"\"$ .

b. The pressure after 1 second is $\"\"$ pascals.