Problem 4.1: What is the period and amplitude of the cosine graph? [Solution]

Problem 4.2: What is the period and amplitude of the graph of the following function: y = 2 sin(4x)? [Solution]

Problem 4.3: Are any of the trigonometric functions stretches of another trigonometric function, vertical or horizontal? [Solution]

Problem 4.4: What is the period and amplitude of the following graph? [Solution]

Problem 4.5: What is the period and amplitude of the following graph? [Solution]