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Jan 15, 2022 at 11:26 history edited esg CC BY-SA 4.0
added explanation, typos corrected
Jan 15, 2022 at 11:24 comment added esg @Fedor Petrov: No, it can be derived independently, using a differential equation/undetermined coefficients. Thanks, I have added that information.
Jan 15, 2022 at 11:20 history edited esg CC BY-SA 4.0
added explanation
Jan 14, 2022 at 20:13 comment added Fedor Petrov does not a proof of $\arcsin^2$ Taylor expansion refer to this identity?
Jan 14, 2022 at 20:01 history answered esg CC BY-SA 4.0