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Apr
23
answered Expected area of triangle formed by three random points inside unit circle
Apr
22
awarded  Good Answer
Apr
20
comment A trigonometric proof of an inequality
Above all, it comes from the chain rule!
Apr
20
comment How do I compute the density of R?
@Hernant Rupani: I had overseen that the OP had already used $X$ for the cut point. I therefore have replaced my $X$ by $S$, which has density $2$, as stated. Hope it's clear now.
Apr
20
revised How do I compute the density of R?
edited body
Apr
20
revised Is it possible to solve the Zebra Puzzle/Einstein's Riddle using pure math?
edited body
Apr
20
answered A trigonometric proof of an inequality
Apr
20
answered $f(x)$ is Riemann integrable $\Rightarrow$ $\frac{1}{1 + f^2(x)}$ is Riemann integrable
Apr
20
revised Power set equinumerosity. Is this proof correct?
added 331 characters in body
Apr
19
answered Geometry with complex numbers.
Apr
19
comment Geometry with complex numbers.
I think that your end result is correct, but I don't see why these angles should add up to $180^\circ$. It's the opposite angles in a circular quadrilateral that add up to $180^\circ$.
Apr
19
awarded  Nice Answer
Apr
18
answered What kind of information is available in a Fourier series expansion of an analytic function that is not (readily) available in a Taylor series?
Apr
18
answered An (open?) problem about a sequence of nested sub-matrices and their determinant
Apr
18
answered Why the radius of convergence and not “areas of convergence” for power series?
Apr
18
revised Two variables Taylor's expansion
added 2 characters in body
Apr
18
answered Two variables Taylor's expansion
Apr
18
answered Solve $x + y + z = xyz$ such that $x , y , z \neq0$
Apr
18
answered maximum area of semi-circle in square
Apr
18
answered Power set equinumerosity. Is this proof correct?