Steeven
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 Apr3 comment Significant figures during intermediate steps in a calculation @ADG Yes, that is the physics book. Apr3 comment Significant figures during intermediate steps in a calculation @ADG Sure, it doesn't matter much. But do you know that feeling of frustation that you should know such a simple rule but apparently don't? If my kidbrother ever asks, I will not know what to say... That scares me. Apr3 asked Significant figures during intermediate steps in a calculation Mar28 awarded Citizen Patrol Feb14 asked $4\times4$ determinant trick Jan16 asked A tough rearranging Dec17 awarded Commentator Dec17 comment Differentiation, using d or delta Is $\delta$ really never used in math as the derivative symbol? E.g. it is used as example for a functional derivative here: en.wikipedia.org/wiki/Functional_derivative Dec16 awarded Caucus Nov10 comment Finding $\frac{\partial}{\partial x}\left(x^2+y^2+z^2\right)^{-1}$ Start with $(x^2+y^2+z^2)^{-1}=\frac{1}{(x^2+y^2+z^2)}$. Then use the chain rule to take the derivative. Nov9 comment Can't do basic integral Your addition "From comments" is missing a minus before the $c$ in the denominator. If you correct this, then you will see that it equals the last expression you have written. You can always simplify integral expressions before integration like this to avoid those troublesome combination rules. Nov8 accepted What is $n!$ when $n=0$? Nov8 awarded Yearling Nov8 answered basic proportions, why the results are inconsistent? Nov8 revised Can't do basic integral added 283 characters in body Nov8 comment Can't do basic integral You were right, I made a mistake with a minus. It is corrected now. And yes, this equals what you have above. Nov8 revised Can't do basic integral added 1 character in body Nov8 revised Can't do basic integral added 10 characters in body Nov8 comment Can't do basic integral What power is reduced? As an example, $\int x^{3} dx=\frac{1}{4} x^4+k$. The power is raised not reduced Nov8 answered Can't do basic integral