Solve d2y/dx2+y=0

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Shortcut for the Variation of Parameters.
How to solve a homogenous second order linear differential equation?
A method to skip "Let y=e^(mx)" but fast and accurate.
Solve d2y/dx2+y=0 by inserting the dummy "m", fast and accurate.
This method is applicable for all homogenous second order linear differential equations.

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#Differential #Equation
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hi! where i can get info about how to demonstrate y= (e^px)(c1cos(ax)+c2sen(ax))
thx!

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