Why aren't the functions $f(x) = \frac{x-1}{x-1}$ and $f(x) = 1$ the same?
49368
Why does factoring eliminate a hole in the limit?
41645
Checking my understanding: $1 - 1 + 1 - 1 + 1 - ... = \frac{1}{2}$
27969
Why does $\frac{1}{x} < 4$ have two answers?
120707
Proof regard to the function $ f\left(x\right)=\begin{cases} x^{2}\sin\left(\frac{1}{x^{2}}\right) & x\neq0\\ 0 & x=0 \end{cases} $
150417
Two apparently different antiderivatives of $\frac{1}{2 x}$
123802
Is the integral of $\frac{1}{x}$ equal to $\ln(x)$ or $\ln(|x|)$?
80060
Is $\frac{1}{\infty}$  equal zero?
30860
Prove that $f(x)=0$ in $[-1,1]$.
52858
Find $f$ if $ f(x)+f\left(\frac{1}{1-x}\right)=x $
132093
Solve $f(f(x))=f(x)$
64134
The difference between two periodic functions converges to zero, is this two functions identical?
29739
How can $\frac{x^3-4x^2+4x}{x^2-4}$ be both $0$ and "undefined" when $x = 2$?
23465
When $f(x+1)-f(x)=f'(x)$, what are the solutions for $f(x)$?
142682
Find $f(x)$ where $ f(x)+f\left(\frac{1-x}x\right)=x$
155096
If $f(x)=x^{n-1}\log x$, then the $n$-th derivative of $f$ is equals?
82448
Why is $f(x) = x\phi(x)$ one-to-one?
17542
Why is $\sqrt{-x}*\sqrt{-x}=-x?$