86. Nα υπολογιστεί το ολοκλήρωμα:
Algebra, Geometry, International Mathematical Olympiads, Math contests, Puzzles, Brainteasers, Number Theory, Combinatorics, Logic, Paradox
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Algebra, Geometry, International Mathematical Olympiads, Math contests, Puzzles, Brainteasers, Number Theory, Combinatorics, Logic, Paradox
=$-\dfrac{1}{10}\int (\dfrac{1}{1+x^{10}})΄x^{5}dx$=
ΑπάντησηΔιαγραφή$-\dfrac{x^{5}}{10(1+x^{10})}+\dfrac{1}{10}\int \dfrac{5x^{4}}{1+x^{10}}dx$=(u=x^{5})
$-\dfrac{x^{5}}{10(1+x^{10})}+\dfrac{1}{10}\int \dfrac{1}{1+u^{2}}du$=
$-\dfrac{x^{5}}{10(1+x^{10})}+\dfrac{arctanx^{5}}{10}+c$