In mathematics , the differential coefficient of a function f -LRB- x -RRB- is what is now called its derivative df -LRB- x -RRB- / dx , the -LRB- not necessarily constant -RRB- multiplicative factor or coefficient of the differential dx in the differential df -LRB- x -RRB- .

In mathematics , the former differential coefficient of a function f -LRB- x -RRB- is now called its derivative df -LRB- x -RRB- / dx . It is the -LRB- not necessarily constant -RRB- multiplicative factor or coefficient of the differential dx in the differential df -LRB- x -RRB- .
