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Question Number 123694 by Dwaipayan Shikari last updated on 27/Nov/20

$$sinh\left(\frac{1}{1^2}\right)+sinh\left(\frac{1}{2^2}\right)+sinh\left(\frac{1}{3^2}\right)+....$$

Commented by Dwaipayan Shikari last updated on 27/Nov/20

$$Anotherapproximationofsin\left(\frac{\pi }{9}\right)$$$$sin\left(\frac{\pi }{9}\right)=\frac{\pi }{9}\prod ^{\mathrm{\infty }}(1-\frac{1}{81n^2})$$$$sin\left(\frac{\pi }{9}\right)=\frac{\pi }{9}(1-\frac{1}{9^2})(1-\frac{1}{{18}^2})(1-\frac{1}{{27}^2})(1-\frac{1}{{36}^2})(1-\frac{1}{{45}^2})....$$

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