15 0 How to take partial derivative of abstract/unknown function? ( 2017-10-04 18:52:36 +0200 )
10 0 How to take partial derivative of abstract/unknown function? ( 2017-10-04 18:52:26 +0200 )
10 0 How to take partial derivative of abstract/unknown function? ( 2017-10-04 18:52:23 +0200 )