(\partial)/(\partial y)(sqrt(26-x^2-4y^2))

解答

\frac{\partial}{\partial y} (26 - x^{2} - 4 y^{2})

- \frac{4 y}{26 - x ^{2} - 4 y ^{2}}

求解步骤

\frac{\partial}{\partial y} (26 - x^{2} - 4 y^{2})

将

x

视为常数

使用连锁律:

\frac{1}{2 26 - x ^{2} - 4 y ^{2}} \frac{\partial}{\partial y} (26 - x^{2} - 4 y^{2})

= \frac{1}{2 26 - x ^{2} - 4 y ^{2}} \frac{\partial}{\partial y} (26 - x^{2} - 4 y^{2})

\frac{\partial}{\partial y} (26 - x^{2} - 4 y^{2}) = - 8 y

= \frac{1}{2 26 - x ^{2} - 4 y ^{2}} (- 8 y)

化简

\frac{1}{2 26 - x ^{2} - 4 y ^{2}} (- 8 y) : - \frac{4 y}{26 - x ^{2} - 4 y ^{2}}

= - \frac{4 y}{26 - x ^{2} - 4 y ^{2}}

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