If the "terminal side" crosses the unit circle at point (x, y) then , . Of course, , , , and [tex]csc(\theta)= \frac{1}{sin(\theta)}[tex].
"All values of so the ." Since cosine is the x coordinate on the unit circle, where does the vertical line cross the unit circle, ?
Surely your text has a definition of "geometric sequence"?
Problem 8 simply asks you to calculate for n= 1, 2, 3, 4, and 5.