Property of functions like $\sin{2x}$
103706
If $\{f(0)\}^{2} + \{f'(0)\}^{2} = 4$ then there is a $c$ with $f(c) + f''(c) = 0$
151947
Finding a pair of functions with properties
8913
Show that there is $\xi$ s.t. $f(\xi)=f\left(\xi+\frac{1}{n}\right)$
23617
Determine whether $f(x)={\sin x \over x}$ is uniformly continuous in $\mathbb R$
37546
Fourier Series for $|\cos(x)|$
18967
Linear independence of $\sin(x)$ and $\cos(x)$
4084
Does there exist a holomorphic function with the following property?
84420
When is $\sin(x) = \cos(x)$?
102086
Prove a property of divisor function
155170
Proving $\sin(x^2)$ Continuous but Not Uniformly Continuous with non-standard Definition
63146
Proof of properties of injective and surjective functions.
22865
Sine function dense in $[-1,1]$
99917
What function satisfies $F'(x) = F(2x)$?
98363
Expanding two-variable function $f(x,y)$ over the complete sets $\{ g_{i}(x) \}$ and $\{ h_{j}(y) \}$
69734
how to find all functions such that $f\left( x^{2} - y^{2} \right) = ( x - y )( f(x) + f(y) )$
56827
Functions that are their Own nth Derivatives for Real $n$
86473
Find all entire functions such that $|f(z)|\leq |\sin(z)|$ for all $z\in\mathbb C$.