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Notation Help: Expression Evaluated From a to b

 
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sjwalsh
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Joined: 17 Apr 2012
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PostPosted: Tue Apr 17, 2012 1:04 pm    Post subject: Notation Help: Expression Evaluated From a to b Reply with quote

Hi, I am writing a paper on Fourier Series and I am trying to write the following equation in the math window:

a sub n = 1 over %pi [ (x^2 over n) sin(nx) - int{(2x over n) sin(nx)dx} ]

But I need to have the [ (x^2 over n) sin(nx) - int{(2x over n) sin(nx)dx} ] evaluated from -π to π and I don't know how to do this notation since I'm not just doing an integral. Can somebody please help me out?

Thanks in advance,
Steve
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Ed
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Joined: 28 May 2003
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PostPosted: Tue Apr 17, 2012 1:29 pm    Post subject: Reply with quote

What notation do you want to use?

An easy way is to put "x=-π" in subscript after the square brackets and "x=π" in superscript.

Note that if you put the command "left" before all the left brackets and "right" before all the right brackets they will stretch to fit what's between them. Also putting a space after each term will help ensure the equation is formatted properly.

For the whole equation you could use:
Code:
a sub n = 1 over %pi left [ left ( x ^ 2 over n right ) sin left (n x right ) - int{ left ( {2 x} over n right ) sin left (n x right )dx} right ]_ {x = - %pi} ^ { x = %pi }
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sjwalsh
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PostPosted: Tue Apr 17, 2012 1:44 pm    Post subject: Reply with quote

Brilliant Ed! Thanks for your help, worked perfectly. Fast too.

Gotta love open office
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