Why is $\frac{x}{\| x \|}$ a unit vector?
140652
Why does dividing a vector by its norm give a unit vector?
150417
Two apparently different antiderivatives of $\frac{1}{2 x}$
27969
Why does $\frac{1}{x} < 4$ have two answers?
152853
What is the intuition behind the unit normal vector being the derivative of the unit tangent vector?
6482
Why aren't the functions $f(x) = \frac{x-1}{x-1}$ and $f(x) = 1$ the same?
132431
Proving $|f'(z)|\leq\frac{\text{Re}(f(z))}{\text{Re}(z)}$
141286
When is $\mathbf{X}^{T}\mathbf{X}+\lambda\mathbf{I}$ invertible?
33097
Proving an inequality without an integral: $\frac {1}{x+1}\leq \ln (1+x)- \ln (x) \leq \frac {1}{x}$
56275
Vector derivative w.r.t its transpose $\frac{d(Ax)}{d(x^T)}$
80710
Does $\int_{-1}^1 \frac 1 x dx$ equal zero?
112551
Demystify integration of $\int \frac{1}{x} \mathrm dx$
100642
Proof of the L'Hôpital Rule for $\frac{\infty}{\infty}$
129394
understanding $\frac{\partial x}{\partial y}\frac{\partial y}{\partial z}\frac{\partial z}{\partial x}=-1$
142821
Why?$\int_0^1\int_{u(t)}^{u(t)+w(t)} f(t,v(t)) dv dt = \int_0^1 f(t,u(t)+\theta w(t))w(t) dt; ~~\theta\in[0,1] $
95068
Integral of $\frac{1}{2x}$
63191
What is the $k-$th derivative of $ \frac{1}{1-x^2}$?
4278
Is $\frac{\vert x+y\vert}{1+\vert x+y\vert}\leq\frac{\vert x\vert}{1+\vert x\vert}+\frac{\vert y\vert}{1+\vert y\vert}$ true?