Calculus 351–355

351. Second-Order Linear Equations
-Second-order linear differential equation
-Homogeneous&Nonhomogeneous
-The superposition principle
-Note

352. General Solution to Homogeneous Case
There is the theorem of the general solution to homogeneous case.

353. Constant-Coefficient Homogeneous Equation(1): Two Real and Unequal Roots
-Idea of auxiliary equation
-Theorem
-Example

354. Constant-Coefficient Homogeneous Eqiations(2): Only Repeated Real Roots
-Theorem
-Idea
-Example

355. Constant-Coefficient Homogeneous Equation(3): Two Complex Roots
-Theorem
-Idea
-Example

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