# Siddhant Trivedi

I'm doing Msc from Gujarat University.

 Nov 26 revised $\theta$ is constructible if and only if $\sin \theta$ is constructible.[Edit removed during grace period] Nov 26 comment $\theta$ is constructible if and only if $\sin \theta$ is constructible.@WimC Yes, because $\sin(90)=1$ and unit length is constructible. Nov 26 revised $\theta$ is constructible if and only if $\sin \theta$ is constructible.added 9 characters in body Nov 26 asked $\theta$ is constructible if and only if $\sin \theta$ is constructible. Nov 26 asked Prove that $45°$ angle can be trisected with straightedge and compass. Nov 8 awarded Popular Question Nov 4 awarded Tumbleweed Nov 2 revised Cyclotomic polynomialdeleted 375 characters in body Nov 2 comment Cyclotomic polynomialCan u give me any proof of first formula? or any link for this. Nov 2 comment Cyclotomic polynomialWhat a proof!really great. Nov 2 accepted Cyclotomic polynomial Nov 2 comment Cyclotomic polynomialIn the 2nd proof how to get 3rd setp?(in the power you changed $\mu(2n/d)$) Nov 2 comment Cyclotomic polynomialI got it.Thanks. Nov 2 revised Cyclotomic polynomialadded 379 characters in body Nov 2 comment Cyclotomic polynomialfor $n>1$ how can i prove this? $$\sum_{1\le k\le n \atop \gcd(k,n)=1} k = \frac{1}{2} \varphi(n) n.$$ Nov 2 comment Cyclotomic polynomialin the right hand side(last term) how can i get $\Phi_{n}(-x)$?i had done induction but i get two times product on divisors. Oct 31 asked Cyclotomic polynomial Oct 28 asked How to convert limit in polar coordinate system Oct 20 comment If $\lim (s_n) = s$ is an element of $S$ then $S$ is closed@Brian If S is subset of $\mathbb{R}^n$ and you are in a metric space then this part is obvious because in metric space the limit of sequence is unique.(In arbitrary topological space limit is not unique as Brian M.Scott ) said. Oct 20 comment Evaluate $\oint_C\frac{dz}{z-2}$ around the circle $|z-2| = 4$@David If u don't know the Cauchy integral formula then this is a link: en.wikipedia.org/wiki/Cauchy's_integral_formula