We have to find the period of the parent cosine function and the period of the function showed on the graph. Period = 2π / B, where B is the coefficient of x - term. 1. For the function: y = cos x, B = 1 Period = 2 π / 1 = 2 π = 360°. 2. For the graphed function ( from the picture ): Period = 6 π = 1,080°
You decide if it has a pattern if it is a repeating pattern then it is a rational number decimal however if it a decimal with no pattern it is irrational
