Integral of (dx)^2: Answers Here

[alpha25]

Hello, does anyone knows the Integral of (dx)^2

Excuse my english, I hope I had make myself clear, thanks

 

[micromass]

I'm thinking you need to be more specific. What is the context here?

 

[alpha25]

In fact i am trying to resolve a a diferencial equation d2y/(dx)^2+y=0
I don´t know how to demostrate that a possibly answer is KCos(x-x0)

 

[D H]

Differentiate that possible answer twice with respect to x. What to you get?

 

[alpha25]

I know that KCos(x-x0) is a solution of d2y/(dx)^2+y=0 but I don t know how to demostrate it!

 

[LCKurtz]

This is a duplicate thread to https://www.physicsforums.com/showthread.php?t=742271

 

[micromass]

Thank You. Locked.