Simplify an expression with respect to one of many variables

*To*: mathgroup at smc.vnet.net*Subject*: [mg130394] Simplify an expression with respect to one of many variables*From*: YI LIU <liuyi.feier at gmail.com>*Date*: Mon, 8 Apr 2013 00:05:56 -0400 (EDT)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*Delivered-to*: l-mathgroup@wolfram.com*Delivered-to*: mathgroup-newout@smc.vnet.net*Delivered-to*: mathgroup-newsend@smc.vnet.net

To all in the group, I have an expression with around 10 variables. I would like to simplify the expression after derivative with respect to one of the 10 variables. Let's say x. However, I didnt find an option for that from Simplify fn. Any suggestion? Thanks

**Follow-Ups**:**Re: Simplify an expression with respect to one of many variables***From:*Bob Hanlon <hanlonr357@gmail.com>

**Re: Simplify an expression with respect to one of many***From:*christopher arthur <chris.arthur1@gmail.com>