Question

Calculate surface integral \[\oint_{S} da \cdot \nabla (r^2)\] where S is the surface of \[x^2+y^2+z^2=R^2\] and r is the length of the vector \[\]

Answer 1

You do know there's a LaTex equation editor option on the bottom, right? Or you could use: http://www.codecogs.com/latex/eqneditor.php and plug it into the euqation editor also.