Chris Card

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952 reputation

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17 Answers

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18	How Can One Prove $\cos(\pi/7) + \cos(3 \pi/7) + \cos(5 \pi/7) = 1/2$
10	If the product of an invertible symmetric matrix and some other matrix is symmetric, is that other matrix also symmetric?
9	Proofs that every natural number is a sum of four squares
5	Area's of rectangle and circle
4	General solution for a differential equation $x = t x^\prime + (x^\prime)^2$

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952 Reputation

+40	Proof that Pi is constant (the same for all circles), without using limits
+10	How Can One Prove $\cos(\pi/7) + \cos(3 \pi/7) + \cos(5 \pi/7) = 1/2$
+20	Proofs that every natural number is a sum of four squares
+5	Simplification of expressions containing radicals

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2 Questions

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19	Proof that Pi is constant (the same for all circles), without using limits
11	Simplification of expressions containing radicals

30 Tags

18 trigonometry	5 combinatorics × 2
18 proof-strategy	5 circle
18 popular-math	4 differential-equations
11 linear-algebra × 2	4 notation
9 number-theory	3 calculus × 2

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