Question

Hi!
Help me please! I don't understand how determine an indefinite multiple integral. For instanse, \iint 1 dxdy = ?

Answer 1

$\iint1dxdy=F(x,y)$ ,where $F(x,y)=y(x+c_1)+c_2$ , where $c_1=const,c_2=const$ , because $\frac{d^2F(x,y)}{dxdy}=1$