Yr11Kid
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dy/dt + y = Sigma Sin(nt)/n^2
HallsofIvy said:Is Sigma simply a constant of do you mean an infinite sum?
\frac{dy}{dt}+ y= \sum_{n=1}^\infty \frac{sin(nt)}{n^2}
In any case henlus' suggestion works- although he meant "integrating factor of the fore exp(t)", not exp(1).