Answer: A
Step-by-step explanation:
ok, so amplitude is the A term, basically the first thing in the equation (1/2) but can’t be negative. the phase shift is in the parentheses, it’s that pi/2, (or 1/2 pi). the period is 1/2 pi since the formula is 2pi/4. (i think that’s right i’m not 100 percent sure
