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19/20 answers
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Oct
29
reviewed Reopen sum of a special sequence of trig-function
Oct
28
reviewed Leave Open If $x^4 = 16$ then $x=2$ : Discrete Math
Oct
28
reviewed Reopen Matrix form of a quadratic function with 3 variables
Oct
27
reviewed Leave Closed Proof by induction help!!!
Oct
27
reviewed Looks OK Proof of the inequality $e^x\le e^{x^2} + x$
Oct
27
reviewed Looks OK Bracket expansion, keeps failing tests.
Oct
27
reviewed Looks OK Show that $\binom{n}{k} \frac{1}{n^k}\leqslant \frac{1}{k!}$ holds true for $n\in \mathbb{N}$ and $k=0,1,2, \ldots, n$
Oct
25
reviewed Looks OK Problem involving the product of a secant and its exterior section that is created through a perpendicular to an extended diameter.
Oct
25
reviewed Looks OK Prove trigonometric identity $\frac{\sin^6x}{1 - \tan^2x} + \frac{\cos^6x}{1-\cot^2x} = - \sin^2x \cdot \cos^2x$
Oct
25
reviewed Close Logarithmic Integration
Oct
25
reviewed Leave Open A finite ring without zero divisors has a neutral element for the multiplication.
Oct
25
reviewed Leave Open what is expected from a PhD student?
Oct
25
reviewed Leave Open Is the action of a finite group always discontinuous?
Oct
24
reviewed Leave Open Number of possible subsets of all sizes
Oct
23
reviewed Leave Open Does the quotient map need to take open sets to open sets, why?
Oct
23
reviewed Leave Open How to prove that R[x] is commutative
Oct
23
revised Does sinc function have any special inverse function defined?
edited body
Oct
23
reviewed Looks OK Does sinc function have any special inverse function defined?
Oct
23
revised Solving $f(x)=f(\frac{1}{x}),\,\,\,x>0$
edited tags
Oct
23
answered Solving $f(x)=f(\frac{1}{x}),\,\,\,x>0$