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 Sep 2 answered Why do both sine and cosine exist? Dec 24 answered Is it OK to evaluate improper integrals this way? Nov 12 answered (UPDATED) Why didn't Archimedes further approximate $\pi$ this way (or did he)? Nov 5 answered Examples of mathematical discoveries which were kept as a secret Jul 23 answered System of non-linear ODE's Jul 23 answered What was the first bit of mathematics that made you realize that math is beautiful? (For children's book) Jul 23 answered What was the first bit of mathematics that made you realize that math is beautiful? (For children's book) Jul 2 answered How fat is a triangle? Jun 26 answered How many squares actually ARE in this picture? Is this a trick question with no right answer? Jun 11 answered What is an example of real application of cubic equations? May 14 answered Real-world applications of prime numbers? Apr 16 answered Limit is found using polar coordinates but it is not supposed to exist. Mar 20 awarded Supporter Mar 14 answered Uses of integral calculus in discrete mathematics? Mar 14 answered Calculate the height of a distant object using estimated angles from two different points. Dec 12 answered Find the limit of $(\sin \frac{1}{n} \cdot \sin \frac{2}{n} \cdot … \cdot \sin 1)^{\frac{1}{n}}$ Nov 16 answered How to find perpendicular vector to another vector? Sep 4 answered Do equal bases imply equal powers? Sep 4 answered How many zeros are there in $1 \times 2^2 \times 3^3 \times \cdots \times 100^{100}$? Aug 10 answered Is it not effective to learn math top-down?