Jordan's inequality
In mathematics, Jordan's inequality, named after Camille Jordan, states that
![{\displaystyle {\frac {2}{\pi }}x\leq \sin(x)\leq x{\text{ for }}x\in \left[0,{\frac {\pi }{2}}\right].}](../I/a6ca4fe8bbd3be495233e733ada39367cc378440.svg)
It can be proven through the geometry of circles (see drawing).
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