Help with differential equation

*To*: mathgroup at smc.vnet.net*Subject*: [mg112239] Help with differential equation*From*: mathpavi <elvisgraceland at gmail.com>*Date*: Mon, 6 Sep 2010 04:14:59 -0400 (EDT)

Dear experts, I tried solving the following differential equation using DSolve: y' ' [x]+a( y' [x] ) = b( cos[y] ) But I got error message which asked me to provide proper arguments for cos.. So I changed cos[y] to cos[kx] and obtained solution... However, I have to solve the equation by keeping cos[y] in order to obtain a solution of relevance to my work. Please help. praveen

**Follow-Ups**:**Re: Help with differential equation***From:*Raul Martinez <raulmart@mac.com>