(\partial)/(\partial x)(sin(8x-9y))

解答

\frac{\partial}{\partial x} (sin (8 x - 9 y))

cos (8 x - 9 y) \cdot 8

求解步骤

\frac{\partial}{\partial x} (sin (8 x - 9 y))

将

y

视为常数

使用连锁律:

cos (8 x - 9 y) \frac{\partial}{\partial x} (8 x - 9 y)

= cos (8 x - 9 y) \frac{\partial}{\partial x} (8 x - 9 y)

\frac{\partial}{\partial x} (8 x - 9 y) = 8

= cos (8 x - 9 y) \cdot 8

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