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trigonometry - Why $\sin(n\pi) = 0$ and $\cos(n\pi)=(-1)^n ...
real analysis - Show that $\sin \dfrac{n \pi}{4}$ is divergent ...
trigonometry - Why is the sin of n times pi always 0 - Mathematics ...
How is sin(npi/2) = (-1)^((n-1)/2) for odd n? - Physics Forums
Prove $a_n = \\sin(n\\pi /2)$ does not converge to $0$
sequences and series - Limit of $\sin(\pi n)$ as $n$ approaches ...
limit of n sin (pi/n) as n - Mathematics Stack Exchange
real analysis - Limit of $sin(n\pi/2)$ as $n$ goes to $\infty ...
$n\\in \\mathbb{N} :\\ \\ \\ \\ \\sin (n \\pi +x)=(-1)^n \\sin x
Integral of $\\sin(\\pi x) \\cos(n\\pi x)$ and $\\sin(\\pi x) \\sin(n ...