general solution and initial condition!! HELP?

satoshi_emiko

New member
y(t): y''-y=t

the general solution is y=A exp(t) +B exp (-t) -t
i don't know how to get the particular solution to be -t..
can someone explain??


and another question
how to find the general initial condition
given initial condition u(x,0)=3sin ((nx)/L) - sin ((3nx)/L) [n=pi]
 
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