I don't really know why I only got an 82 when I understood this unit so well. Well, I do know; I messed.up the domain and range a lot. Other than that, I did pretty well and understood it.
2c. tan(arccos 3/5) = 4/3 or -4/3
2b. Arccos(sin pi/2) = Arccos1 = 0 and 180
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