**Problem : **
What is the period and
amplitude of the cosine
graph?

**Problem : **
What is the period and amplitude of the graph of the following
function:
*y* = 2 sin(4*x*)
?

**Problem : **
Are any of the trigonometric
functions stretches of another
trigonometric function, vertical or horizontal?

**Problem : **
What is the period and amplitude of the following graph?

**Problem : **
What is the period and amplitude of the following graph?