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Funktion $$$e^{- \frac{\ln\left(7\right)}{x}}$$$ derivaatta
Aiheeseen liittyvät laskurit: Logaritmisen derivoinnin laskin, Vaiheittainen implisiittisen derivoinnin laskin
Syötteesi
Määritä $$$\frac{d}{dx} \left(e^{- \frac{\ln\left(7\right)}{x}}\right)$$$.
Ratkaisu
Funktio $$$e^{- \frac{\ln\left(7\right)}{x}}$$$ on kahden funktion $$$f{\left(u \right)} = e^{u}$$$ ja $$$g{\left(x \right)} = - \frac{\ln\left(7\right)}{x}$$$ yhdistelmä $$$f{\left(g{\left(x \right)} \right)}$$$.
Sovella ketjusääntöä $$$\frac{d}{dx} \left(f{\left(g{\left(x \right)} \right)}\right) = \frac{d}{du} \left(f{\left(u \right)}\right) \frac{d}{dx} \left(g{\left(x \right)}\right)$$$:
$${\color{red}\left(\frac{d}{dx} \left(e^{- \frac{\ln\left(7\right)}{x}}\right)\right)} = {\color{red}\left(\frac{d}{du} \left(e^{u}\right) \frac{d}{dx} \left(- \frac{\ln\left(7\right)}{x}\right)\right)}$$Eksponenttifunktion derivaatta on $$$\frac{d}{du} \left(e^{u}\right) = e^{u}$$$:
$${\color{red}\left(\frac{d}{du} \left(e^{u}\right)\right)} \frac{d}{dx} \left(- \frac{\ln\left(7\right)}{x}\right) = {\color{red}\left(e^{u}\right)} \frac{d}{dx} \left(- \frac{\ln\left(7\right)}{x}\right)$$Palaa alkuperäiseen muuttujaan:
$$e^{{\color{red}\left(u\right)}} \frac{d}{dx} \left(- \frac{\ln\left(7\right)}{x}\right) = e^{{\color{red}\left(- \frac{\ln\left(7\right)}{x}\right)}} \frac{d}{dx} \left(- \frac{\ln\left(7\right)}{x}\right)$$Sovella vakion kerroinsääntöä $$$\frac{d}{dx} \left(c f{\left(x \right)}\right) = c \frac{d}{dx} \left(f{\left(x \right)}\right)$$$ käyttäen $$$c = - \ln\left(7\right)$$$ ja $$$f{\left(x \right)} = \frac{1}{x}$$$:
$$e^{- \frac{\ln\left(7\right)}{x}} {\color{red}\left(\frac{d}{dx} \left(- \frac{\ln\left(7\right)}{x}\right)\right)} = e^{- \frac{\ln\left(7\right)}{x}} {\color{red}\left(- \ln\left(7\right) \frac{d}{dx} \left(\frac{1}{x}\right)\right)}$$Sovella potenssisääntöä $$$\frac{d}{dx} \left(x^{n}\right) = n x^{n - 1}$$$, kun $$$n = -1$$$:
$$- e^{- \frac{\ln\left(7\right)}{x}} \ln\left(7\right) {\color{red}\left(\frac{d}{dx} \left(\frac{1}{x}\right)\right)} = - e^{- \frac{\ln\left(7\right)}{x}} \ln\left(7\right) {\color{red}\left(- \frac{1}{x^{2}}\right)}$$Näin ollen, $$$\frac{d}{dx} \left(e^{- \frac{\ln\left(7\right)}{x}}\right) = \frac{e^{- \frac{\ln\left(7\right)}{x}} \ln\left(7\right)}{x^{2}}$$$.
Vastaus
$$$\frac{d}{dx} \left(e^{- \frac{\ln\left(7\right)}{x}}\right) = \frac{e^{- \frac{\ln\left(7\right)}{x}} \ln\left(7\right)}{x^{2}}$$$A