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Cliff Pickover on Twitter: "For you math nerds. A mysterious & wonderful proof that pi=4. At which step does it go wrong? https://t.co/JmcpTk5prv" / Twitter
How do you find the value of cos(pi/4)? | Socratic
Q: Ο = 4? | Ask a Mathematician / Ask a Physicist
Q: Ο = 4? | Ask a Mathematician / Ask a Physicist
Pi is 4
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What is pi? | Live Science
Cliff Pickover on Twitter: "For you math nerds. A mysterious & wonderful proof that pi=4. At which step does it go wrong? https://t.co/WjXQzTIEv6" / Twitter
Sin pi/4 - Find Value of Sin pi/4 | Sin Ο/4
How to Falsely Prove That Pi Equals 3: 7 Steps (with Pictures)