I would like to ask if someone could help me how to reach the following equation. \begin{equation} \sin(x) = x\left(1-\frac{x^{2}}{\pi^{2}}\right)\left(1-\frac{x^{2}}{4\pi^{2}}\right)\left(1-\frac{x^{2}}{9\pi^{2}}\right)\left(1-\frac{x^{2}}{16\pi^{2}}\right)\left(1-\frac{x^{2}}{25\pi^{2}}\right) \cdots \end{equation} Thank you in advance.
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1This is Euler's product formula for the sine function. A discussion for it on MSE is here. EDIT: The proposed duplicate link is probably better and more detailed so I went ahead and seconded its closure vote. – PrincessEev Jun 11 '19 at 09:52
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Thank you very much. – Jun 11 '19 at 09:53