Question

The gas law for a fixed mass m of an ideal gas at absolute temperature T, pressure P, and volume V is PV = mRT, where R is the gas constant. Find the partial derivatives
[(∂P)/(∂V)] = ???
[(∂V)/(∂T)] = ???
[(∂T)/(∂P)] = ???
[(∂P)/(∂V)] [(∂V)/(∂T)][(∂T)/(∂P)] = ??? (an integer)