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If [math]\arcsin x + \arctan x = \frac{\pi}{2} [/math], how do I prove that [math]2x^2+1=\sqrt{5}[/math]? - Quora
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Dave Richeson on Twitter: "Euler proved that π/4=arctan(1/2)+arctan(1/3), which can be used for computing digits of π (using the arctangent series). I wondered if I could prove it without using a trig
arctan(x) | inverse tangent function
arctg(2–3x) = –π/4
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Dave Richeson on Twitter: "Euler proved that π/4=arctan(1/2)+arctan(1/3), which can be used for computing digits of π (using the arctangent series). I wondered if I could prove it without using a trig