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There are a couple syntax errors in your code. I would not recommend assigning a set of equations to a variable and then passing that variable into an NDSolve or DSolve. Additionally the constants that are present in your differential equations do...
It looks like you would like this for syntactical purposes of using your own notation. Although, it might make solving some problems easier with simpler relations, plotting and in use of solver functions. Simply define your own function: c=3 ...
You may also specify the number of decimal places you would like the exact numerical solution to be approximated to by calling:N[Expression,3] Where 3 indicates that you will receive three decimal places.
Hello Josh, Please post some of the code that you have been executing or eact phrasings of what you enter into Wolfram Alpha.  If you have access to Wolfram Mathematica, I highly suggest that you utilize that in the future. You can solve your...
Hello Veit, Although I have not seen such an application in Mathematica, if you need to solve this problem under time contraints sooner than allow for finding an equivalent solution in Mathematica I suggest FORTRAN with some adaptations to some codes...