## 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.

## Comments

Sort by:

TopNewestYeah, it's an elegant proof which was given by

Augustin Louis Cauchyand perhaps the most well-known and elementary proof because all other proofs require higher advanced calculus whereas this one uses none of such methods and only basic polynomial properties and some trigonometry.And I remember that I mentioned about it in one of my papers on Binomial Theorem.\(\ddot \smile\) – Kishlaya Jaiswal · 1 year, 10 months ago

Log in to reply