Question: what is b in cos?
Answer: Again, using y = A sin(Bx) and y = A cos(Bx). The number, B, in front of x is number of cycles seen in 0 to 2π interval. The value B is the number of cycles the graph completes in an interval of from 0 to 2π or 360º. The value B affects the period. The period of sine and cosine is.