Answer:
Answer=C
Step-by-step explanation:
A. The smaller the number, the wider the graph. That equation had the smallest number, so therefore it will produce the widest graph.
The first has no r , only 0 since it is a straight line.
Letter D
A = 135°
B = 30°
cosAcosB - sinAsinB = cos(A+B)
cos(135°+30°)
cos(165°)