**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!

## 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 :) – Azhaghu Roopesh M · 1 year, 10 months ago

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– Omkar Kulkarni · 1 year, 10 months ago

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! :DLog in to reply

– Azhaghu Roopesh M · 1 year, 10 months ago

Ok :)Log in to reply

I have also Contributed a wiki on "Routh's Theorem". I will be posting more soon. – Swapnil Das · 1 year, 10 months ago

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– Calvin Lin Staff · 1 year, 10 months ago

Thanks, I saw that :)Log in to reply

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. – Samuel Ayinde · 1 year, 10 months ago

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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! – Calvin Lin Staff · 1 year, 10 months ago

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– Samuel Ayinde · 1 year, 10 months ago

Ok sir, thank you!!!!Log in to reply

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. – Omkar Kulkarni · 1 year, 10 months ago

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– Sharky Kesa · 1 year, 9 months ago

I did some additional work on the Half-Angle Tangent Substitutions.Log in to reply

It is latex convention that \le produces \( \le \) and \ge produces \( \ge \). – Arron Kau Staff · 1 year, 10 months ago

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– Omkar Kulkarni · 1 year, 10 months ago

Oh okay. Thanks! :)Log in to reply