also, $a_1=a$ and $b_1=b$

can someone find $$\lim_{n\to\infty}a_{n}$$ This question is from guillaume musso's novel. I remember that the answer included $\arccos$ thing..

  • $\begingroup$ Which novel, by the way? $\endgroup$ – J.G. Mar 12 at 17:52
  • $\begingroup$ @J.G. La Jeune Fille et la Nuit $\endgroup$ – scitamehtam Mar 13 at 16:56

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