1. 3
Point A ,5 ; Point B , 3 ; Point C ,1
4 4
A math teacher, I. M. Right, told the class that the equation for the graph above was:
y 4 cos 2 x 1
4
Darcy, the whiz kid, piped up and said the equation should be written as:
y 4 cos 2 x 1
4
Pat quickly said, “No, no, the equation should be written as: y 4 cos 2 x 1 .”
2
a) Who of the above is/are correct? Justify your answer.
b) Lyn said, “I can write an equation for this graph involving the sine function.” Write such
a possible equation.