The application of Euler's reciprocity relation (cross-derivative rule) to the volume of 1 mole of an ideal gas results in mixed second derivative of V equal to
1
\(\rm -\frac{R}{P^2}\)
2
\(\rm -\frac{RT}{P^2}\)
3
\(\rm \frac{R}{P}\)
4
\(\rm \frac{2RT}{P^3}\)