â£xâ£<1|x| < 1â£xâ£<1 ãªãå®æ° xxx ã«ã¤ãã¦ï¼ arcsinâ¡x=x+16x3+340x5+â¯arccosâ¡x=Ï2âxâ16x3â340x5ââ¯\begin{aligned} \arcsin x &= x + \dfrac{1}{6} x^3 + \dfrac{3}{40} x^5 + \cdots\\ \arccos x &= \dfrac{\pi}{2} - x - \dfrac{1}{6} x^3 - \dfrac{3}{40} x^5 - \cdots \end{aligned}arcsinxarccosxâ=x+61âx3+403âx5+â¯=2Ïââxâ61âx3â403âx5ââ¯â ã¨ãªãã ãã®è¨äºã§ã¯éä¸è§é¢æ°ã®ãã¡éæ£å¼¦é¢æ°ï¼arcsinâ¡\arcsinarcsinï¼ã¨éä½å¼¦é¢æ°ï¼arccosâ¡\arccosarccosï¼ã®ãã¯ãã¼ãªã³å±éãè¨ç®ãã¾ã
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