Question

a cosine function that passes through the points (1/2,1) and (3/2,-3).
the equation is f(x)= 2cos(πx-π/2)-1
Maximum value: y=1
Minimum value: y=-3
Midline: y=-1

Identify phase shift

Answer 1

could you show how you found that using formulas

Answer 2

Use phase shift and b to determine c. (phase shift = -c/b)