General Solution of the first order differential equation

Yr11Kid
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dy/dt + y =\infty\sumn=1Sin(nt)/n^2
 
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The equation is of the form
<br /> \frac{\mathrm{d}y}{\mathrm{d}t} = P(t)y(t) + Q(t)<br />
with
P(t)\equiv -1 and Q(t):=\sum_{n\ge 1}{\frac{\sin(nt)}{n^2}}. So, try with the formula
<br /> y(t) = \exp\left(\int{P(t)\mathrm{d}t}\right)\left(\int{Q(s)\exp\left(-\int{P(s)}\mathrm{d}s\right)\mathrm{d}s})\right) \biggr|_{s=t}<br />
 

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