Mathematical Errors:
Forgetting the constant C for an indefinite integral.
Adding a constant C for a definite integral.
Sign errors. I sometimes marked off for this. One sign error comes up when making substitutions. Another sign error happens when using integration by parts.
Stylistic Errors:
Doing problems out of order.
Using a lot of paper, possibly only one side
Writing messy
Being concise can work wonders.
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