Watkins Adkins
03/08/2024 · Elementary School
5. Exprimer \( r \) en fonction de \( f \) et \( f^{\prime} \). Les fonctions \( r \) et \( \theta \) sont fixées ainsi pour la suite de la partie. (a) Montrer que \( \theta^{\prime}=-1+q \sin (\theta) \cos (\theta) \) (b) Montrer que \( r^{\prime}=q r \sin ^{2} \theta \). En déduire la monotonie de \( r \). (c) Etudier les variations de \( t \mapsto r(t) \exp (-\arctan (t)) \) et en déduire que \( 0 \leq r(t) \leq r(0) \exp \) (arctar que \( r \) a une limite strictement positive en \( +\infty \).
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\( r \) est une fonction croissante et bornée entre 0 et \( r(0) \exp(\arctan(t)) \). En \( +\infty \), \( r \) tend vers une limite strictement positive.
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