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Basic Mathematical Concepts

Which statement is correct for a real gas-

$\left(\frac{\partial U}{\partial V}\right)$ at constant P = -ve

$\left(\frac{\partial U}{\partial V}\right)$ at constant T = -ve

$\left(\frac{\partial U}{\partial V}\right)$ at constant P = +ve

$\left(\frac{\partial U}{\partial V}\right)$ at constant T = +ve