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or you can just do them in 10 secI get the same problems as well :/
If you're finding troubles with solving the questions I'd usually try to learn and understand the concept in that exercise in a much more depth. I'd usually leave out those repetitive questions like
1. Derive
a) 2x
b) 4x^2
c) e^x
If they're too repetitive and easy try skipping and do the harder questions. That's what i'd usually do.