matovitch
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 5 $\sum \cos$ when angles are in arithmetic progression 3 Prove $\left|\frac{x^2y^3}{x^4+y^4}\right|\leq |x|+|y|$ 1 Maclaurin expansion $\log\left( \frac{1+x}{1-x}\right)$, show equality of two sums 1 Distribution of a continuous random variable 1 Eigenvalues of a matrix

### Reputation (196)

 +40 $\sum \cos$ when angles are in arithmetic progression +45 Prove $\left|\frac{x^2y^3}{x^4+y^4}\right|\leq |x|+|y|$ +5 Vertex Definition (Linear optimization) +15 How fast is a low denominator encountered, when using only mediants?

### Questions (3)

 1 Vertex Definition (Linear optimization) 0 Quantization minimizing the quadratic error 0 Cyclic monotonicity of sub-differential domain and convex property

### Tags (20)

 5 trigonometry 1 probability 3 inequality 1 sequences-and-series 1 linear-algebra × 2 0 elementary-number-theory 1 calculus 0 fractions 1 eigenvalues-eigenvectors 0 conic-sections

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 Stack Overflow 497 rep 113 Mathematics 196 rep 7 Super User 101 rep Code Review 101 rep 1 Programming Puzzles & Code Golf 101 rep 1