__Ten Algebraic Trig
Calculators__

__Created
By____
David@TechForText.com,
©2010__

__To contact the author use the
above email address, or__

__Left click on these words for a website
communication form.__

__ __

__This website provides ten free
algebraic trigonometry calculation devices, in the online JavaScript, and
spreadsheet formats. The online versions of the calculators are embedded
in this webpage, below this introduction. If you want the spreadsheet
versions, or additional information, scroll all the way down beneath the online
Calculators.__

__Instructions__

To use any of the ten Calculators enter numbers in the set of white input boxes, associated with the Calculator you are using. To enter or delete numbers you must first left click with the mouse on the relevant white input box. Each calculator functions independently, and numbers entered for one calculator do not cause calculations in the other calculators.

For calculated results, left click with the mouse on the background, (anywhere except on the white input boxes.) Alternatively, for the online JavaScript version you can press the calculation button, and for the spreadsheet version you can press the enter key.

Before all the numbers are entered into a Calculator, you may see error messages. If the user enters numbers that do not satisfy an equation error messages will also be displayed.

Each Calculator has an error checking device, which functions by substituting the calculated result into the unsolved version of the equation. If the left and right sides of the equation result in numbers that are equal, the device displays the words No error. If this is not the case, the device displays the word: Error.

Note: The __embedded__ page
(below) with the Calculators is equivalent to a 10 page document. To see all of
the Calculators you must scroll all the way down.

__Algebraic Trig
Calculators, and __

__Links____ to Obtain the Free
Downloads__

__The Software You
Need__

The spreadsheet versions of the
__Calculators__ require either Microsoft Excel, or the free OpenOffice.org
software package, which is available at www.OpenOffice.org. In addition, Microsoft
Windows is required for the spreadsheet versions.

The JavaScript version of the Calculator can run on any operating system that has JavaScript support, but I only tested it with Microsoft Windows. In addition, the JavaScript version requires a browser that supports JavaScript. Almost all modern operating systems and browsers support JavaScript.

__Download Links for
the____
Algebraic Trig Calculators, In the __

__Microsoft Excel, OpenOffice Calc,
and Javascript Formats__

**If you want the Algebraic Trig
Calculators in the Microsoft Excel format, left click on these
words.**

**Note: If you do not have Microsoft
Excel, download the OpenOffice.org software package, because it is free and it
is almost as good as the Microsoft Office suite. To download go
to**__ __**www.OpenOffice.org**__ __**or left click on these
words.****
**

**If you want a diverse assortment
of calculation devices for algebra and trigonometry, go to the main website
at**** ****www.TechForText.com/Algebra****, ****This can be done by left clicking
on these words.**** **

__Technical
Information, and How the __

__Ten
Algebraic Trig Calculators were Created__

The Ten Algebraic Trig Calculators were initially created in Microsoft Excel. The JavaScript versions were created from the spreadsheet versions. This involved a conversion process, with specialized software.

Spreadsheet formulas were created for each Trig Calculator. To do this the equation shown on the top of each calculator were solved for an unknown. Then, the resulting equation was translated manually into a format that is recognized by spreadsheet software.

For educational purposes, the spreadsheet formulas used for each calculation device are displayed directly on the device itself, near the location of the actual formula, which is not visible. You may copy and/or modify these formulas, and use them for your own needs.

The name mechanism, in Microsoft
Excel, was used to define the meaning of each symbol used in the spreadsheet
formulas. This involved defining letters in the formulas, in terms of
specific input boxes. This method results in spreadsheet formulas that
more or less look similar to conventional formulas. The alternative method
uses cell designations instead of letters. Formulas created with cell
designations __do__ not look like conventional mathematical
expressions.

__ __

__ __

__Services Offered by
the Author__

This website was designed to
maximize efficiency and ease-of-use (usability, user-friendliness). The
text is presented with relatively large fonts. The paragraphs are short,
and the sentence structure and wording were written to maximize
comprehension*. The website has a very simple layout, on a single
page. This makes it easy to __navigate intuitively__, by scrolling down
or up. All the links for downloads and websites are also written with
large fonts, and clearly marked as links, such as with the following words:
* left click on these words*.

Note: The ideas on this website and the Algebraic Trig Calculators are technical, and they require knowledge of trigonometry. In addition, some familiarity with spreadsheets and computer technology is also needed for maximum comprehension.

__Services Offered by
the Author David@TechForText.com__

I design and build user-friendly
software based calculation devices for __arithmetic__, __accounting__,
__currency exchange rates__,
__algebra__, __trigonometry__,
__correlations__, __calculus__, and databases with built-in calculation
devices. I also create attractive online calculation devices for websites,
and web communication forms. This includes forms with built-in calculation
devices. **For a list of websites
with calculation devices that I created, left click on these words, or go to the
following website: www.TechForText.com/Math**

I generally make these devices in the Microsoft Excel, OpenOffice.org, and the JavaScript formats, but I can work with other spreadsheet formats besides the above.

I write instructions for the devices I build. I can also write instructions for software and computer devices created by others. In addition, I can write advertising for your websites, products and services.

I can provide the services
mentioned above on a fee-for-service basis, or possibly based on temporary or
permanent employment. If you are interested in my services, and want
additional contact information or more data on the services I offer, you can
email me at **David@TechForText.com
**or **use a website communication
form, by left clicking on these words.**

I am located in the USA. If you are a great distance from my locality or are in another country, this is not important. I can provide these services worldwide, because the software and websites I make can be delivered through the Internet to any locality, providing there are no governmental restrictions.

For a list of all the services I
offer see **www.TechForText.com**

For a list of all my websites see
**www.David100.com**

My resume is online at: **www.David100.com/R**

**To return to the top of this website left click on these
words**