1. (difficult) Direct proofs can be difficult to get, because sometimes there is only one way to go about proving them, or one proof. If you don't have the right way of seeing the question, then you could get stuck in the proof, or go in a circle. Also, sometimes you don't have the necessary assumptions at hand to know what to do in the situation.
2. (reflective) The last time I did proofs was in middle school in geometry, when proving that two angles were equal by use of many theorems. At the time we would make two columns: one with the logic statements, and one with the theorems being used to prove. We have yet to be introduced to a proper format for writing our conclusions along the way.
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