Question 920588
3 cos (2πx ). 
Amplitude : 3
Period: 2
x-intercepts:  -7/4, -5/4, -3/4, -1/4, 1/4, 3/4, 5/4 , 7/4
{{{drawing(300,300,   -2, 2, -4, 4, grid(1), blue(line(.25,6,.25,-6)) ,

graph( 300, 300, -2,2, -4, 4,0, 3cos(2pi*x)) )}}}