Finding the Antiderivative of 2xy

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Homework Statement


It is simple: find the antiderivative of 2xy.


Homework Equations





The Attempt at a Solution


I am inclined to say that it equals (xy)^2 +c, but can't help but feel i have left out something.
 
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What are you integrating with respect to? Are both x and y variables?
 
Yes, they are both variables.
 
rock.freak667 said:
What are you integrating with respect to? Are both x and y variables?

BJducky said:
Yes, they are both variables.
Then answer the question! You want to find the anti-derivative with respect to which variable?

\int 2xy dx= x^2y+ C

\int 2xy dy= xy^2+ C

Choose one!
 
There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...
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