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<!DOCTYPE html> | ||
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<html lang="pl" data-content_root="../../../"> | ||
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<title>Przez podstawienie — Matematyka - dokumentacja</title> | ||
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accesskey="I">indeks</a></li> | ||
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<div class="document"> | ||
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<section id="przez-podstawienie"> | ||
<h1>Przez podstawienie<a class="headerlink" href="#przez-podstawienie" title="Link to this heading">¶</a></h1> | ||
<div class="admonition-podstawienie admonition"> | ||
<p class="admonition-title">Podstawienie</p> | ||
<p>Niech <span class="math notranslate nohighlight">\(G(y)\)</span> będzie funkcją pierwotną funkcji <span class="math notranslate nohighlight">\(g(y)\)</span> a <span class="math notranslate nohighlight">\(f(x)\)</span> będzie klasy <span class="math notranslate nohighlight">\(C^1\)</span>. | ||
Wtedy $\int g(y)dy |_{y = f(x)} = \int g(y) f’(x) dx</p> | ||
<div class="admonition tip"> | ||
<p class="admonition-title">Wskazówka</p> | ||
<div class="math notranslate nohighlight"> | ||
\[\begin{split} | ||
\int \sqrt{1-x^2} dx \\ | ||
x = sin t \\ | ||
dx = cos t dt \\ | ||
\int \sqrt{1-sin^2t} cos t*dt = \\ | ||
= \int cos^2(t) dt = \frac{1}{2} \int 2 cos^2{t} dt = \\ | ||
= \frac{1}{2} \int 1 + cos(2t) dt = \\ | ||
= \frac{1}{2} (t + \frac{1}{2} sin(2t)) = \\ | ||
\frac{1}{2} arcsin(x) + \frac{1}{2}x \sqrt{1-x^2}\end{split}\]</div> | ||
</div> | ||
</div> | ||
<div class="math notranslate nohighlight"> | ||
\[\begin{split} | ||
I_n = \int \frac{1}{(1+x^2)^n} \\ | ||
I_1 = arctg(x) \\ | ||
I_n = \int \frac{1+x^2 - x^2}{1+x^2} dx = \int \frac{dx}{(1+x^2)^n} - \int \frac{x^2}{(1+x^2)^n}dx = \\ | ||
= I_{n-1} - \int \frac{x^2}{(1+x^2)^n} | ||
I_n = \frac{1}{2n-2} \frac{x}{(1+x^2)^{n-1}} + \frac{2n-3}{2n-2} I_{n-1} | ||
\end{split}\]</div> | ||
</section> | ||
<section id="calki-funkcji-wymiernych"> | ||
<h1>Całki funkcji wymiernych<a class="headerlink" href="#calki-funkcji-wymiernych" title="Link to this heading">¶</a></h1> | ||
<div class="math notranslate nohighlight"> | ||
\[ | ||
\int \frac{P(x)}{Q(x)} = ? | ||
\]</div> | ||
<p>Należy znaleźć rozkład funkcji na ułamki proste:</p> | ||
<table class="docutils align-default"> | ||
<thead> | ||
<tr class="row-odd"><th class="head"><p>f(x)</p></th> | ||
<th class="head"><p><span class="math notranslate nohighlight">\(\int f(x) dx\)</span></p></th> | ||
</tr> | ||
</thead> | ||
<tbody> | ||
<tr class="row-even"><td><p><span class="math notranslate nohighlight">\(\frac{A}{x-A}\)</span></p></td> | ||
<td><p>$ln(x-A)</p></td> | ||
</tr> | ||
<tr class="row-odd"><td><p><span class="math notranslate nohighlight">\(\frac{A}{(x-A)^k}\)</span></p></td> | ||
<td><p><span class="math notranslate nohighlight">\(\frac{-1}{x-1} ....\)</span></p></td> | ||
</tr> | ||
</tbody> | ||
</table> | ||
<ul class="simple"> | ||
<li><p><span class="math notranslate nohighlight">\(\frac{Cx - B}{(x-p)^2 + q^2}\)</span></p></li> | ||
<li><p><span class="math notranslate nohighlight">\(\frac{Cx - B}{((x-p)^2 + q^2)^k}\)</span></p></li> | ||
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<li><a class="reference internal" href="#">Przez podstawienie</a></li> | ||
<li><a class="reference internal" href="#calki-funkcji-wymiernych">Całki funkcji wymiernych</a></li> | ||
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>indeks</a></li> | ||
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