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Jan
21
comment Probability that the Series ends in $6$ games in the World series.
What if X loses the second and fourth game but wins every other game?
Jan
17
answered Calculate: $\lim_{x\to 0} \frac{f(x^2)-f(0)}{\sin^2(x)}$.
Dec
31
comment Prove: Expectation value is the weighted average
It's not clear what you mean with the notation in the right hand side. Provide some context please.
Dec
19
comment 7 hats, 6 prisoners
I suppose they can't talk/communicate with each other and they can't see their own hat's number.
Dec
15
comment Formulae of the Year $2016$
Which makes of $2016=2^5(2^6-1)$ a pernicious number, but sadly not a perfect number.
Dec
7
answered Questions on Quaternion Algebra (introductory stuff)
Dec
6
revised Curvature of a Convex Plane Curve
edited body
Dec
6
answered Curvature of a Convex Plane Curve
Dec
5
comment Maximization of a complex function with real outputs
There's no upper bound on the value.
Nov
16
awarded  Yearling
Nov
7
comment Pointing at a specific coordinate on a plane
I thought the other would be so obvious I wouldn't need to mention it. Here you go: $b=\tan^{-1}\frac{Y}{X}$.
Nov
6
comment Pointing at a specific coordinate on a plane
$a=\tan^{-1}(\frac{\sqrt{X^2+Y^2}}{A})$.
Nov
6
answered How many boys have passed given the following conditions?
Oct
27
answered Derive the commutation relation
Sep
29
awarded  Popular Question
Sep
19
revised Fourier series for square-wave function?
Someone edited the post and I don't agree with the changes made. First, the intervals are closed-open. Not just closed. Second, the equation in the edit is generally true, regardless of what $f$ is. So I'd rather not write that it is equal to zero.
Sep
18
revised epsilon delta for limits of complex variables
deleted 54 characters in body; edited tags
Sep
16
revised Please solve this matrix question. I'm stuck.
added 4 characters in body
Sep
13
revised Fourier series for square-wave function?
added 730 characters in body
Sep
12
comment Fourier series for square-wave function?
Look at your Fourier series for $f$. Integrate both sides. Because the $\sin$ and $\cos$ get integrated over a (or several) full period(s), they integrate to zero. But not the constant term.