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A cool second-order differential equation problem

The function $y(t)=e^{-2t}cos\ t-e^{-2t}sin\ t\text{,}\ t_0=0$ is a solution of the initial value problem $y''+ay'+by=0$, where $y(t_0)=y_0$ and $y'(t_0)=y_0'$. Determine the constants $a$, $b$, $y_0$, and $y_0'$.

Check out the solution HERE.

Solving a 2nd order ordinary differential equation using Variation of Parameters

An infamous question from an MIT entrance exam, 1876