(\partial)/(\partial y)((3xy)/(x^2+y^2))

解

\frac{\partial}{\partial y} (\frac{3 x y}{x ^{2} + y ^{2}})

\frac{3 x ( x ^{2} - y ^{2} )}{( x ^{2} + y ^{2} ) ^{2}}

解答ステップ

\frac{\partial}{\partial y} (\frac{3 x y}{x ^{2} + y ^{2}})

x

を定数として扱う

定数を除去:

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

= 3 x \frac{\partial}{\partial y} (\frac{y}{x ^{2} + y ^{2}})

商の法則を適用:

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

= 3 x \frac{\frac{\partial}{\partial y} ( y ) ( x ^{2} + y ^{2} ) - \frac{\partial}{\partial y} ( x ^{2} + y ^{2} ) y}{( x ^{2} + y ^{2} ) ^{2}}

\frac{\partial}{\partial y} (y) = 1

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

= 3 x \frac{1 \cdot ( x ^{2} + y ^{2} ) - 2 yy}{( x ^{2} + y ^{2} ) ^{2}}

簡素化

3 x \frac{1 \cdot ( x ^{2} + y ^{2} ) - 2 yy}{( x ^{2} + y ^{2} ) ^{2}} : \frac{3 x ( x ^{2} - y ^{2} )}{( x ^{2} + y ^{2} ) ^{2}}

= \frac{3 x ( x ^{2} - y ^{2} )}{( x ^{2} + y ^{2} ) ^{2}}