$f(x)=\frac{x^2 -4}{x-2}$, Can $x=2$ or not?
105433
Graphing $y = \frac{x^2-4}{x-2}$
112778
Let $f(x) = x^3-\frac{3}{2}x^2+x+\frac{1}{4}.$ Then the value of $ \int^{3/4}_{1/4}f(f(x))\mathrm dx$
2414
If $f \in \operatorname{Hol}(D)$, $f(\frac{1}{2}) + f(-\frac{1}{2}) = 0$, prove that $|f(0)| \leq \frac{1}{4}$
40070
Is there a real-valued function $f$ such that $f(f(x)) = -x$?
53024
$f(x)f(1/x)=f(x)+f(1/x)$
122407
If $f(x) = x^3+3x+4\;,$ Then value of $ \int_{-1}^{1}f(x)dx+\int_{0}^{4}f^{-1}(x)dx$
121984
Let $f (x)= x^7 -105x + 12$ then which of the following options is correct?
19561
Why is $\frac{1}{\frac{1}{X}}=X$?
41779
Is $x/x$ equal to $1$
14548
Multivariable limit $\frac{(2x^2)y}{x^4+y^2}$
138544
For which values of $x$, will $f (x) . f '(x) < 0$?
113045
How do I find the inverse of $f(x) = \frac{x}{x^2 + 1}$
144859
Finding parameters for $f(x) = x^2 + 2(m − a)x + 3am −2 = 0$ that satisfy a condition.
96973
If $F(0,0)=0$ and $F(x,y)= \frac{xy}{x^2+y^2}$ for $(x,y)\neq (0,0)$ then $F$ is differentiable at $(0,0)$?
27969
Why does $\frac{1}{x} < 4$ have two answers?
132093
Solve $f(f(x))=f(x)$
66406
How to calculate $f(x)$ in $f(f(x)) = e^x$?