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05 May 2008 @ 10:32 pm
I have an assignment due where I have to intergrate sin(x)/((1 + x^2)^2) by substuting u = 1/(1 + x^2) and I have no idea how to do it? anyone got any ideas.
11 March 2008 @ 04:14 pm
if f(x) = 1/(x+1), prove that f^2(x) = (x+1)/(x+2).

Hence find an expression for f^3(x)

I really didn't get it, so... if there's anyone out there that could explain it, please do.

Thank you.
13 September 2007 @ 05:48 pm
This is such a stupid question but I just wanna make sure-


Haha, is that right??
10 August 2007 @ 11:42 pm
Does anyone one know the rules for combing Differential Equations?


\frac{dj}{dx} = -C'\frac{dV}{dt} ;


\frac{dV}{dx}=-L'\frac{dj}{dt} ;

I need to get:

L'C'\frac{d^{2}V}{dt^{2}} = \frac{d^{2}V}{dx^{2}} ;

L' and C' are conductance and capacitance per unit length, and d is intended to represent lower case delta.

The problem concerns transmission lines.
06 February 2007 @ 05:51 pm
Loscha's great calculator sell off continues. Selling my TI-89 Titanium graphing calculator. In excellent condition.

The most powerful calculator TI make that will fit in your pocket!
It should cost $20au to post internationally.
01 February 2007 @ 05:50 pm
What calculators do you own and use?

I have (and use)
Texas Instruments:
TI-84+, TI-89 Titanium, TI-30X IIB (a normal scientific, I have the white/silvery one, but, would love to get a purple/green/blue one, too) and a TI-80 which I got for $5 at a hock shop because it was cute and twee and baby sized.
FX-100d quite a rare one. I have 2. It has hex, milli micro nano pico kilo mega symbols on some buttons (very bloody useful for electronics engineering)

Slide Rules:
Three, various kinds. Favourite is a Hemmi (Earnest) my then best friend got me from an op shop she worked at (with it's manual).

A really old version of Derive (dos), copied from the computers at my high school back in 1991.
I'm starting to get into YACAS, which I am finding useful.
I've used dodgies of Matlab and Mathematica, but, I'm not good enough at Math to really get maximum value from them.
16 January 2007 @ 11:45 pm

OK, they're not much, but, I thought I'd make some ditzy banners for people to put on their userinfo if they felt compelled to do so. They are made with TI calculator fonts.
16 January 2007 @ 10:59 pm
Poll #907774 How Do You?

What tool do you primarily use to do your math stuff?

Scientific Calculator
Graphing Calculator
Spreadsheet (Excel, Open Office, 123)
Open Source Math Package (YACAS, etc)
Matlab, Mathematica, Maple, Derive
Pen and Paper
Programming Language (please specify)
Other (please list below)
Specifically This (please list below)

Expansion of Q1

I Do Math

Because of My Course (Tertiary, Tafe, University)
Because I like It
For My Job
I need to (for values of need approaching psychological compulsion)
I'm a Secondary School Student
Other (please specify below)

Expansion of Q3

I have the following qualifications

Tertiary Degree (math related)
Incompleted Tertiary
Completed Secondary School
It's my hobby, I just tinker
I'm a computer programmer

Helping others

I'm here to help others
I'm here to get help
A bit of both
Here to see how this thing pans out
I'm here cause I want to stalk other memers of this group
16 January 2007 @ 05:12 pm
Hi all, my name is loscha.
I like mathematics.
I'm not extremely good at it, I don't have a degree, but, I enjoy it.
I enjoy helping other people with what I can.

This is a community for people to help others with (probably simple) math problems.

Not everyone knows how to use a normal calculator to work out what 17.25% discount on $35.50 is.

Hopefully, We can help.

I personally am a Wikipedian, and a Texas Instruments graphing calculator user, and somewhat of a collector of old calculators.
I bet I could add up the change in your purse very fast.