Найти неопределенный интеграл [tex]arctg\sqrt{2x-1} dx[/tex]. Created by sobakazabiyaka. algebra-ru

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November 2021 1 32 Report

Найти неопределенный интеграл
[tex]arctg\sqrt{2x-1} dx[/tex]

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NNNLLL54

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$\int arctg\sqrt{2x-1}\, dx=\Big[\ t^2=2x-1\ ,\ t=\sqrt{2x-1}\ ,\ x=\dfrac{t^2+1}{2}\ ,\ dx=t\, dt\Big]=\\\\\\=\int arctgt\cdot t\, dt=\Big[\ u=arctgt\ ,\ du=\dfrac{dt}{1+t^2}\ ,\ dv=t\, dt\ ,v=\dfrac{t^2}{2}\ ,\\\\\\\int u\, dv=uv-\int v\, du\ \Big]=\dfrac{t^2}{2}\cdot arctgt-\dfrac{1}{2}\int\dfrac{t^2\, dt}{1+t^2}=\\\\\\=\dfrac{t^2}{2}\cdot arctgt-\dfrac{1}{2}\int\Big(1-\dfrac{1}{1+t^2}\Big)\, dt=\dfrac{t^2}{2}\cdot arctgt-\dfrac{1}{2}\cdot \Big(t-arctgt\Big)+C=$

$=\dfrac{2x-1}{2}\cdot arctg\sqrt{2x-1}-\dfrac{1}{2}\cdot \Big(\sqrt{2x-1}-arctg\sqrt{2x-1}\Big)+C=$

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