Added non homogeneoous linear ruler eq
Corrected the documentation
corrected nameerror
Added trialset match in nonhomogeneous euler eq
Fixed the error coming due to Dummy
added simplfication of log function
undetermined coeff type solved
corrected all test cases
variation of parameters integral solved
Able to solve eq for symbolic coeff
Added separate method for nonhomogeneous euler eq Includes both undetermined coefficients and variation of parameters to solve nonhomogeneous euler equations
Merge pull request #7290 from KDMOE/nonhomogeneous_euler_eq

ODE: Added non homogeneoous linear euler eq fixes #7172