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Solving Second Order Systems of Differential Equations
ye
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Tricks for Remembering Laplace Transforms
for students and people who forgot
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Skipping Integration by Parts Using Euler's Formula
skip or simplify integrals involving trig functions multiplied by exponentials
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Introduction to Euler's Formula
the best formula
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Constructing Integer 2x2 Second Order Systems of Differential Equations with Integer Solutions
It's a lot messier.