nbubis

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272 Answers

newest activity votes
30
What is the real life use of hyperbola?
20
Show that $z^6 + 5z^4 - z^3 + 3z$ has at least two real roots given that all roots are distinct.
15
Prove that $A+I$ is invertible if $A$ is nilpotent
14
Why isn't math on the sine of angles the same as math on the angles in degrees?
11
How is “area” a vector?
10
How come $\int_{-\infty}^\infty \! e^{-|t|} \, \mathrm{d} t = 2\int_{0}^\infty \! e^{-|t|} \, \mathrm{d} t$?
9
About a harmonic series problem : How to prove that $\sum_{n=1}^{\infty}\frac{H_n}{n^3}=\frac{\pi^4}{72}$
9
$\lim_{a \to 0^{+}} \int_{0}^{a} \frac{1}{\sqrt{\cos(x)-\cos(a)}} \;dx=\frac{\pi}{\sqrt{2}}$
9
Using mathematics in theoretical physics
9
Finding $\int x^xdx$
8
What does $ d\tan(x) = \sec^2(x)dx $ mean?
7
I need to prove that $f$ continuous at $(x)=0$ using a $\epsilon$-$\delta$ proof
7
What is your definition for neighborhood in topology?
6
Convergence of the $\sum \frac{\ln(n!)}{n^{\alpha}}$
6
Why $\Delta(c^2)=2c(\Delta c) $?
6
certain proofs of the irrationality of $\sqrt{2}$
5
evaluate $\int_0^\infty \dfrac{dx}{1+x^4}$ using $\int_0^\infty \dfrac{u^{p-1}}{1+u} du$
5
Are numbers with repeating patterns in their decimal expansion (e.g. $0.123123123\ldots$) rational?
5
Solving 4 unknown angles in quadrilateral possible?
5
Limit calculation
5
Finding the probability that a student is a random guesser
5
what is the equation to get this type of a curve?
5
how exactly did calculus change our understanding of the world?
5
Does $\tan(1/z)$ has a Laurent series convergent?
4
Finding the antiderivative of $\frac 1{(1-x^m)^n}$,with $n,m\in\Bbb N$
4
What are the drawbacks of multiple-choice questions?
4
The $43$rd derivative of $\sin(x^{13}+x^{15})$ | Calculus 1
4
How to find finite trigonometric products
4
Second Order Cosine Differential Equation
4
Solve${{\int_{-1}^{\infty }{\left( \frac{{{x}^{4}}}{1+{{x}^{6}}} \right)}}^{2}}dx$
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