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29m
awarded  real-analysis
9h
revised Triangle inscribed in another triangle
edited tags
9h
revised Farthest point on parallelogram lattice
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10h
revised Digit sum of $n^2$ is 44
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11h
revised Computing the sum of an infinite series
edited body
11h
answered If $x,y,z \in \Bbb{R}$ such that $x+y+z=4$ and $x^2+y^2+z^2=6$, then show that $x,y,z \in [2/3,2]$.
11h
revised If $x,y,z \in \Bbb{R}$ such that $x+y+z=4$ and $x^2+y^2+z^2=6$, then show that $x,y,z \in [2/3,2]$.
edited tags
12h
revised Find the equation of the circle.
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15h
answered Determining dimension of a sum of subspaces in terms of a parameter
17h
revised Max value of trignometric function $\sin \left(x+\frac\pi6\right)+\cos \left(x+\frac\pi6\right)$
edited tags
17h
revised Is there a pattern present?
added 8 characters in body
18h
revised Inequality involving a product over the primes
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18h
revised Definition of positive density
added Wikipedia link
18h
revised Technical question in Vandermonde determinat proof
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18h
comment Find the sum of the series $\sum \frac{1}{n(n+1)(n+2)}$
Another question about the same series: Find the sum of the series $\sum_{n=1}^{\infty} \frac{1}{n \cdot (n+1) \cdot (n+2)}$
18h
comment Find the sum of the series $\sum_{n=1}^{\infty} \frac{1}{n \cdot (n+1) \cdot (n+2)}$
See also: Find the sum of the series $\sum \frac{1}{n(n+1)(n+2)}$ and What is the proof for $\sum_{n=1}^{\infty}\frac{1}{n(n+1)(n+2)} = \frac{1}{4}$
18h
revised Kernel of ring homomorphism
edited tags
18h
comment What is the actual geometric meaning of trigonometric operations such as adding cos,sine,tan
Maybe some of the diagrams in this Wikipedia article might be interesting for you: en.wikipedia.org/wiki/Phasor#Addition
19h
revised Prove using $ \varepsilon-\delta $ that $ \lim_{(x,y)\to(1,1)} \frac {x^2+2xy-3y^2}{x^2-y^2} = 2 $
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19h
revised Finding roots of $2x^3-5x^2+18x+45$
edited tags; more descriptive title