Differential Equations course leaves out two crucial methods of solving first-order equations
I'm taking DifEq, and I was disappointed to find that Khan Academy does not cover first-order linear equations and their method of solving (multiplying by an integrating factor). There is also no material on solving by substitution. Rectifying this would be very helpful to students of higher-level math, as any college Differential Equations course will require mastery of these topics.
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