If y = A*sin(Bx + C) + D is substituted as y = -1.5 sin(x + π/4) + 4, what
would the cosine function be in order to match the graph of said sine
function?
Note that . You can show this using the subtraction formula for sin. In terms of the graphs it means the graph of cos(x) is shifted by pi/2 to the right on the x axis