Quick Review
Sine and cosine curves are used in applications that involve circular motion. The amplitude of y = sin x and y = cos x is 1, the maximum value. A constant in front of sin x or cos x changes the amplitude of the graph. The amplitude of y = A sin x is |A|. The amplitude of y = A cos x is |A|.
- Given: y = sin has amplitude = |1| = 1
- Given: y = sin has amplitude = || =
- Given: y = 3 cos has amplitude = |3| = 3
- Given: y = -5 cos has amplitude = |-5| = 5
Graph y = sin
Graph y = - sin |