$\frac{\sin(x)}{x} \geqslant \frac{16 \pi^4}{\left(3 \pi^2+x^2\right)^2}-1$

hbghlyj

证明 $\forall x \in (0,\pi)$,$$\frac{\sin(x)}{x} \geqslant \frac{16 \pi^4}{\left(3 \pi^2+x^2\right)^2}-1$$

已发到math.stackexchange.com/questions/5000182/lowe … ions/5000183#5000183