DESTINATION ALERTS — Apr 13

How do you get $\alpha$ from $\tan{\alpha}$?

How do you get $\alpha$ from $\tan{\alpha}$? Hello, I want to know how to obtain $\alpha$ from $\tan...

CELEB FITNESS — Apr 13

Find a normal vector onto the line

How can I find normal vector on the given line. For example if I have a line $3x - 5y = 1$, what wou...

BEAUTY TIPS — Apr 13

What's 110 degrees counterclockwise from positive direction of x-axis?

What are the x and y components of a vector a with arrow in the xy plane if its direction is 110° c...

DESTINATION ALERTS — Apr 13

Goldschmidt division example with estimates?

I have found in Gonzalez/Diaz-Herrera/Tucker: Computing Handbook an example for the Goldschmidt divi...

CELEBRITY STYLISTS — Apr 13

Motivation behind study of martingales

Today I wanted to ask a question which I am sure has been answered in multiple places but for which ...

CHILD STARS — Apr 13

How to represent a logic equivalence?

In propositional logic we have the DeMorgan's laws: $$\lnot (p\lor q) \Leftrightarrow \lnot ...

MUSIC AWARDS — Apr 13

sum of all the numbers that can be formed using the digits 2,3,3,4,4,4..

How to find the sum of all the numbers that can be formed using the digits 2,3,3,4,4,4.. What should...

HERITAGE — Apr 13

What is the meaning of the symbol "$\left|\underline{\;n\;}\right.$" for integer $n$?

For example, (6) The sequence of primes is endless. For, if $p$ is any prime, the number ${\...

ENTREPRENEURSHIP — Apr 13

Inverse laplace transform of $\frac{1}{s^3(s-1)}$

I have a problem with this transform. I know that using this theorem (see the theroem) I can get the...

FARMING NEWS — Apr 13

Can covariance be negative?

So I always thought that covariance could take any real number. However, in class today my professor...

DESTINATION ALERTS — Apr 13

Center of mass and moment of inertia of a $2$-dimensional donut?

I have a an assignment and I'm stuck on this question: First of all I can't figure out th...

SPORTS NEWS — Apr 13

Prove this formula $1+\cos\theta+\cos2\theta+...+\cos n\theta=\frac{1}{2}+\frac{\sin(n+\frac{1}{2})\theta}{2\sin\frac{\theta}{2}}$ [duplicate]

This is homework but I’m really stuck. The question is to prove a fromula which states: $$1+\cos\t...

CHILD STARS — Apr 13

Sigma notation formula $i=0$ [closed]

I am trying to help a high school student to solve summation calculation problems. The $i$ value of ...

STYLE UPDATES — Apr 13

Calculate distance in 3D space

Imagine I want to determine the distance between points 0,0,0 and 1,2,3. How is this calculated?...

CELEBRITY PHILANTHROPY — Apr 13

Rate of Change of Volume in a Sphere

Assume that the radius $r$ of a sphere is expanding at a rate of $7$ in. /min. The volume of a spher...

GLOBAL UPDATES — Apr 13

Eigenvectors in Matlab/Octave, function "eig()", why are the eigenvectors output like that? [closed]

You can calculate eigenvectors of a matrix with eig() function like this: [eigenvectors, eigenvalue...

GLOBAL UPDATES — Apr 13

Difference in logic notations for maths and computer science

I am reading: How to prove it, A structured approach by Daniel J.Velleman and despite it being a boo...

BEAUTY TIPS — Apr 13

Find sample size given standard deviation, sample mean, confidence interval

A machine is set up such that the average content of juice per bottle equals u. Assume that the popu...

CELEBRITY PHILANTHROPY — Apr 13

derivative with respect to constant.

I have been beating my head against this question for quite some time, I do not know whether it has ...

LIFESTYLE — Apr 13

How to derive the Riemann Curvature Tensor?

I'm taking a course in General Relativity, and before getting into Physics itself, the required...

MARKET TRENDS — Apr 13

Calculation of Radon–Nikodym derivative

Suppose the function $X \colon \mathbb{R} \longrightarrow \mathbb{R} \colon x \longmapsto X(x) : = x...

MUSIC AWARDS — Apr 13

How do you find the radius with only the slant height? Please show work.

The radius of the circle is 12cm, it is then made into a cone Question: A cone is made by joining ...

SPORTS NEWS — Apr 13

How can one "cancel out" set union as if I am using the additive property of equality of real numbers?

I am aware that for equalities involving, for instance involving real numbers, we have the cancellat...

DESTINATION ALERTS — Apr 13

Function transformation: shrink horizontally

Write the formula for $f(x)$, if the graph of $f$ can be obtained from the graph of $y = g(x)$ by sh...

HERITAGE — Apr 13

Are there more even numbers than odd numbers?

Very simple 'yes-or-no' question, but I can't find the answer anywhere. My gut feelin...

LAW AND JUSTICE — Apr 13

Derivation of the energy equation in fluid dynamics

I'm working through Acheson's 'Elementary Fluid Dynamics' and i'm having tr...

LIFESTYLE — Apr 13

Calculate remainder of $12^{34^{56^{78}}}$ when divided by $90$

Calculate remainder of $12^{34^{56^{78}}}$ when divided by $90$ First of all,I'm not sure abou...

FARMING NEWS — Apr 13

Probability of Posting a Quad and Trip on 4chan

Important Pre-Requisite Knowledge On the image board 4chan, every time you post your post gets a 9 ...

GLOBAL UPDATES — Apr 13

Meaning of the spectral norm of a matrix

Is there an intuitive meaning for the spectral norm of a matrix? Why would an algorithm calculate th...

INSTAGRAM STARS — Apr 13

Find the number of bicycles and tricycles [duplicate]

Help for my son. My math is a bit rusty and I'm trying to remember how to go about answering t...

MARKET TRENDS — Apr 13

What is an anti chain

Which of the following is the correct definition of an anti chain .. 1). A subset S of a partially ...

MUSIC AWARDS — Apr 13

Drawing Plausible Phase Portrait

The equation: $$\dot{x} = f(x),\space x\in \mathbb{R},\space \text{where} \space f\begin{pmatrix}x_...

CELEB FITNESS — Apr 13

multiplication in H-space and loopspace of the H-space

Let $X$ be an $H-space$, and let a multiplication $,\cdot,$ be given, associative up to homotopy. L...

CELEBRITY PHILANTHROPY — Apr 13

SageMath: defining class of functions on Elliptic Curves

In SageMath, I would like to manipulate rational functions on elliptic curves (defined on finite fie...

GLOBAL UPDATES — Apr 13

How many ways $12$ persons may be divided into three groups of $4$ persons each?

How many ways $12$ persons may be divided into three groups of $4$ persons each? I think the answer...