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Apr
3
comment Significant figures during intermediate steps in a calculation
@ADG Yes, that is the physics book.
Apr
3
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.
Apr
3
asked Significant figures during intermediate steps in a calculation
Mar
28
awarded  Citizen Patrol
Feb
14
asked $4\times4$ determinant trick
Jan
16
asked A tough rearranging
Dec
17
awarded  Commentator
Dec
17
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
Dec
16
awarded  Caucus
Nov
10
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.
Nov
9
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.
Nov
8
accepted What is $n!$ when $n=0$?
Nov
8
awarded  Yearling
Nov
8
answered basic proportions, why the results are inconsistent?
Nov
8
revised Can't do basic integral
added 283 characters in body
Nov
8
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.
Nov
8
revised Can't do basic integral
added 1 character in body
Nov
8
revised Can't do basic integral
added 10 characters in body
Nov
8
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
Nov
8
answered Can't do basic integral