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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.
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Constructing Integer 2x2 First Order Systems of Differential Equations with Integer Solutions
Nice solutions? Nice.
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Matrix Exponential Formulas for 2x2 Matrices Using Laplace Transforms
this has been rewritten