- #1

- 2,552

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[itex] y=Ae^{ix} [/itex] but then when I square it I get [itex] A^2 e^{2ix} [/itex]

I found y' and y'' and solved for A and it didn't work I guess I could use the formula for reducing powers but I would like to try and get around that.

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- Thread starter cragar
- Start date

- #1

- 2,552

- 3

[itex] y=Ae^{ix} [/itex] but then when I square it I get [itex] A^2 e^{2ix} [/itex]

I found y' and y'' and solved for A and it didn't work I guess I could use the formula for reducing powers but I would like to try and get around that.

- #2

lurflurf

Homework Helper

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- 138

$$(D^3+4D)(\sin(x))^2=0$$

or

(sin(x))^2 is a solution of y'''+4y

chose the particular solution from those solutions

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