**Thanks to all of our previous wiki contiributors!**

Last week, we held a "Weekend Wiki Party" and asked if anyone would be willing to help develop the wikis for a chapter in calculus that needed some attention. We had great results and 75% of the pages that were empty in that chapter were filled. Over 500 people have benefited from those pages in the past week.

Since there's still some areas of the wiki that need further development, we thought we'd ask again for your help and contributions.

Our goal this weekend is to fill out and improve some of our Trigonometric Identities in our Geometry section. A few important identities are completely missing an explanation on our wikis. With everyone’s help, we can make these pages something that the community is proud of. To participate, feel free to jump in and write something helpful on one of the following (currently empty) pages:

- Product to Sum Formulas
- Sum to Product Formulas
- Inverse Trig Identities
- Half Angle Tangent Substitution

If you'd rather improve an existing page, the following page would benefit from additional explanation and more examples:

When you have made an edit that you are proud of, please make a comment and let us know!

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`*italics*`

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boldNote: you must add a full line of space before and after lists for them to show up correctlyparagraph 1

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## Comments

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TopNewestI'll start on one of those tomorrow sir and I believe I can contribute by making some nice questions too !

@Omkar Kulkarni

Dude , what say ? Isn't trigonometry your forte ? I think it'll be best if you are among the contributors :)

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My boards still going on! :( I have the last exam on the 24th! Till then I don't think I can find the time. I'll contribute after that! :D

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Ok :)

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I wrote a wiki on Root test. Actually sir, it's not part of the wikis you listed out. I'm very sorry for that.

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Thanks for your contribution. We love wikis in any areas, and not just in the ones that we listed up here. There are numerous people who contribute to the other wikis too. There's nothing to be sorry about! We are very grateful that you're improving the wikis for everyone :)

We felt that it would be more fun to have people to work on the same / similar wikis, so that the topics would be more developed out.

In fact, we are planning on making an announcement about the amount of cooperation that goes on in these wikis :) Stay tuned!

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Ok sir, thank you!!!!

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I have also Contributed a wiki on "Routh's Theorem". I will be posting more soon.

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Thanks, I saw that :)

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I added to Sum to Product Formulas, Inverse Trigonometric Identities and Half-Angle Tangent Substitution. I can't think of anything Product to Sum Formulas is missing. Also, I can't think of any examples for Half-Angle Tangent Substitution, so that's blank.

A small question. Are \le and \ge supposed to produce \(<\) and \(>\) respectively? Or are they incorrect tags? Because when I tried using them, they produced \(\leq\) and \(\geq\) respectively.

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Omkar, thank you for your contributions. In answer to your question, yes the tags you used are shortcuts for "Less than or Equal" or "Greater than or Equal".

It is latex convention that \le produces \( \le \) and \ge produces \( \ge \).

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Oh okay. Thanks! :)

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I did some additional work on the Half-Angle Tangent Substitutions.

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