Write the equation of a cosine function whose amplitude is 3 and period is pi/4

b) 36

step-by-step explanation:

18 times 2 is 36

none of the above.

for one of the equations to be used in the process, there has to be a term in the equation since squared is .

since there is only a term in the first equation, we cannot derive a from completing the square.

solving with completing the square

i think the answer is c sorry if it's wrong