(dy/dt) + y = cos (e^t)??? how???
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Originally Posted by crafty (dy/dt) + y = cos (e^t)??? how??? Integrating factor $\displaystyle \mu = e^t$ so $\displaystyle \frac{d}{dt} \left( e^t y \right) = e^t \cos e^t$ $\displaystyle \int d \left( e^t y \right) = \int e^t \cos e^t\, dt + c$ I trust you can do the rest.
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