## Excel in math and science

### Master concepts by solving fun, challenging problems.

## It's hard to learn from lectures and videos

### Learn more effectively through short, conceptual quizzes.

## Our wiki is made for math and science

###
Master advanced concepts through explanations,

examples, and problems from the community.

## Used and loved by 4 million people

###
Learn from a vibrant community of students and enthusiasts,

including olympiad champions, researchers, and professionals.

Easy Math Editor

`*italics*`

or`_italics_`

italics`**bold**`

or`__bold__`

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

paragraph 2

`[example link](https://brilliant.org)`

`> This is a quote`

Remember to wrap math in \( ... \) or \[ ... \] to ensure proper formatting.`2 \times 3`

`2^{34}`

`a_{i-1}`

`\frac{2}{3}`

`\sqrt{2}`

`\sum_{i=1}^3`

`\sin \theta`

`\boxed{123}`

## Comments

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TopNewestWhat is WeChat???

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My favorite comment of all time too. But I can't even tell the difference between QQ and Wechat, except that Wechat is supposed to be targeted towards more Western audiences.

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Haha, was expecting this comment! :D

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Hahaha

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Oh no, I don't know what is troll and what isn't. I guess we've entered real troll status.

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Yeah, better watch out. Have you gotten any of my emails?

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Well I'm on skype but not on we chat

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For anybody who doesn't know, WeChat is like KiK+Skype. It's pretty cool.

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What is Kik?

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Well, Kik is WeChat - Skype. Does that help?

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