Mathematics
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Apparently, this user prefers to keep an air of mystery about them.

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12 The length of coil winding on cylinder. Jan 9 '18
6 Number of hand of cards with exactly 3 aces (Unsure if answer is correct) Dec 22 '17
6 Prove $\sum_{i=1}^{n}i^3=\frac{1}{4} n^2(n+1)^2$ (induction) Sep 12 '18
6 Find all complex numbers $z$ that satisfy equation $z^3=-8$ Oct 10 '18
5 find $A,B$ in way that $f:A\rightarrow B$ is bijective, when $f(x)=\sqrt{x^2-1}$ Sep 20 '18
5 Prove $\lim_{x\rightarrow -3} 1-4x=13$ Sep 23 '18
5 Prove $ \frac{d^n}{dx^n}\ln(x)=\frac{(n-1)!(-1)^{n-1}}{x^n} $ by induction Oct 17 '18
5 Proof with induction that $n^2+n$ is even, when $n \in \mathbb{N}$ [duplicate] Jun 14 '19
4 Proof matrix $A=\begin{bmatrix} 1 & 1 \\ 0 & 1 \end{bmatrix}^n , \text{ when } n \in \mathbb{N}$ [duplicate] Nov 12 '18
4 Compute the area of a given set Feb 8 '18
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