Common Errors in Undergraduate Mathematics (2009)
<i>For instance, contrary to the belief of many students<p>sin(x + y) is NOT sin(x) + sin(y)<p>(x+y)^2 is NOT (x^2) + (y^2)<p>sqrt(x+y) is NOT sqrt(x) + sqrt(y)<p>1/(x+y) is NOT (1/x) + (1/y)</i><p>Wow, seriously? Especially the one with the fraction is painful. I'm not sure if university is the right place for people who still make mistakes like that at that age (if they had more than a decade of public school behind them). Certainly not STEM fields.