I was using the TI-84 Plus calculator to check for Y-Axis symmetry in the graph of "cos(2X+1)" and as I had to do it fast (I was in the middle of a test),...

When we say the area of a rectangle is the product of the length by the width is it a definition based on geometric intuition or is it a result? I know it...

Is it possible to create one single matrix which contains all of these three rotation matrices? $$R(x) = \begin{pmatrix}1 & 0 & 0 & 0 \\ 0 &am...

Find linear transformation $F$ in canonical bases given $ F: \Bbb R^4 \to \Bbb R^3 $ $ \ker F=\operatorname{span}\left\{\begin{bmatrix}1\\2\\3\\4\end{bmat...

Can a non-square matrix have a full rank? I always see cases with square matrix with full rank but seldom with non-square matrix. Can anyone help on this?...

there will be an $a$ let's prove $-a$ is unique. let's assume there are 2 additive inverses $b$ and $c$ therefore $a+b=a+c$ let's multiply ...

Is this proposition true? $\mathbb R \nsubseteq \mathbb N $ It may seem trivial, but I want to be sure. Also would the simple "not subset" operator withou...

This question should be an easy one :) I couldn't find it already in stackexchange so thought it would be worth asking. As I understand it: A Maximal...

I am going to take a calculus course soon and everyone tells me that it is very difficult. What is considered difficult about it and why do so many people...

I have a function $f \colon R^3 \to R$. I want to find $x$, $y$, $z$ such that $f(x,y,z)=0$. I'm using the method from here: http://en.wikipedia.org/...