Period
The next topic of discussion is about changing the period of a function.
You learned about the period of a function in the last section, but here is a quick review of the definitions.
The period of the functions f(x) = sin(kx), f(x) = cos(kx), f(x) = csc(kx), and f(x) = sec(kx) is 
, for k > 0.
The period of the functions f(x) = tan(kx) and f(x) = cot(kx) is 
, for k > 0.
The following is a graphical explanation of a period for a trigonometric function:
