Just have a quick question about this problem in the photo... I'm not sure how they got the values 0, 1, 0, -1, 0 that they are multiplying by y=sin-x in the chart: For example. Look at the second row, pi/2. They apparently multiply 1/2 by 1 to get 1/2, but they never indicate where/how they are getting the values to multiply by the amplitude of 1/2. I'm guessing, but I don't want to guess, that it is due to the fact that the sin goes up from 0 to 1, down to 0 again, and then all the way down to -1. It seems like they are basing it off of the y-values from this previous page in the text: Again, not really sure about this. Am I supposed to base it off of the standard values for y=sin-x?