How to prove that $\sin(\sqrt{x})$ is not periodic?
33628
Prove that $\sin(\sqrt x)$ not periodic
16642
Showing $a_n=\sin(n)$ does not converge
46642
Continuity of $\sin(x)/x$
21843
Proving a function is not Riemann integrable
123476
Prove $[\sin x]' = \cos x$ without using $\lim\limits_{x\to 0}\frac{\sin x}{x} = 1$
73248
Prove that $\mathbb{R^*}$, the set of all real numbers except $0$, is not a cyclic group
84420
When is $\sin(x) = \cos(x)$?
151439
$\sqrt{1-x^2}$ is not a rational function
33689
How to find the period of an arbitrary mathematical function?
22865
Sine function dense in $[-1,1]$
69046
Proof of $\mathbb{Q}$ is not cyclic
16253
Proof that $|\sin(nx)| \le n|\sin(x)|$
91744
Proving sum of sines is periodic when ratio of their frequencies is rational using differentation
44307
Prove $\sqrt[3]{3} \notin \mathbb{Q}(\sqrt[3]{2})$
124208
Proof $|\sin(x) - x| \le \frac{1}{3.2}|x|^3$
6465
How to prove periodicity of $\sin(x)$ or $\cos(x)$ starting from the Taylor series expansion?
105487
Prove that $\sin x \cdot \sin (2x) \cdot \sin(3x) < \tfrac{9}{16}$ for all $x$