(\partial)/(\partial x)(-(9x^2)/(x^2+y^2))

Lösung

\frac{\partial}{\partial x} (- \frac{9 x ^{2}}{x ^{2} + y ^{2}})

- \frac{18 x y ^{2}}{( x ^{2} + y ^{2} ) ^{2}}

Schritte zur Lösung

\frac{\partial}{\partial x} (- \frac{9 x ^{2}}{x ^{2} + y ^{2}})

Behandle

y

als Konstante

Entferne die Konstante:

(a \cdot f)^{'} = a \cdot f^{'}

= - 9 \frac{\partial}{\partial x} (\frac{x ^{2}}{x ^{2} + y ^{2}})

Wende die Quotientenregel an:

(\frac{f}{g})^{'} = \frac{f ^{'} \cdot g - g ^{'} \cdot f}{g ^{2}}

= - 9 \cdot \frac{\frac{\partial}{\partial x} ( x ^{2} ) ( x ^{2} + y ^{2} ) - \frac{\partial}{\partial x} ( x ^{2} + y ^{2} ) x ^{2}}{( x ^{2} + y ^{2} ) ^{2}}

\frac{\partial}{\partial x} (x^{2}) = 2 x

\frac{\partial}{\partial x} (x^{2} + y^{2}) = 2 x

= - 9 \cdot \frac{2 x ( x ^{2} + y ^{2} ) - 2 x x ^{2}}{( x ^{2} + y ^{2} ) ^{2}}

Vereinfache

- 9 \cdot \frac{2 x ( x ^{2} + y ^{2} ) - 2 x x ^{2}}{( x ^{2} + y ^{2} ) ^{2}} : - \frac{18 x y ^{2}}{( x ^{2} + y ^{2} ) ^{2}}

= - \frac{18 x y ^{2}}{( x ^{2} + y ^{2} ) ^{2}}

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