Draw the graph of the following function for 0 ≤ x ≤ 2π. Please state the period and amplitude of the final function. y=3cos[2x+π/2]− 2

Answer 1

for drawing graph, need domain shift from parent functioin

always rewrite y=3cos[2x+π/2]− 2

as y=3cos[2[x+π/4]]− 2

now know to shift cos(0)=1 by -π/4 on x axis.