Because if you haven't seen trigonometric integrals before - for example, you're going to be very lost when they explain it quickly. And they do explain it quickly.
They have assumed knowledge because they'll tend to skip over the stuff you've seen in 3u or go super quickly through it. I remember my lecturer going on about trigonometric integrals and he just said, "You've seen this in 3 unit before so I'm going to just skim through this very quickly".




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