Chris Card

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17 Answers

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18

How Can One Prove $\cos(\pi/7) + \cos(3 \pi/7) + \cos(5 \pi/7) = 1/2$

may 3 '12 at 14:01

10

If the product of an invertible symmetric matrix and some other matrix is symmetric, is that other matrix also symmetric?

jan 21 '11 at 11:27

9

Proofs that every natural number is a sum of four squares

dec 31 '10 at 9:00

5

Area's of rectangle and circle

apr 13 '11 at 15:43

5

What does E mean in 9.0122222900391E-5?

oct 7 '10 at 16:23

4

General solution for a differential equation $x = t x^\prime + (x^\prime)^2$

jan 16 '11 at 15:11

3

How do you show this property of a differentiable function given information about the derivative?

apr 16 '11 at 12:40

3

How many disconnected graphs of the Rubik's cube exist?

oct 1 '10 at 12:55

2

Coloring dodecahedron

jul 26 '11 at 16:24

1

Solving a division with imaginary numbers

oct 30 at 16:43

1

continuously differential parametrization of a tricky surface

oct 17 at 12:29

1

Good (Auto)Biographies of von Neumann and other physicists/mathematicians

may 10 '11 at 7:32

1

Solution in integer to a system of linear equations

mar 6 '11 at 15:58

0

Positive and Negative Real numbers

oct 16 at 13:04

0

Range of values of f(x) using quadratic inequalities (need intuition)

apr 22 '11 at 16:03

0

Maclaurin polynomial of $\ln(\cos(x))$

feb 1 '11 at 13:16

0

Trigonometric integral question

dec 6 '10 at 21:45

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