sin2x-sin2y等于多少
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发布时间:2022-10-12 22:25
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时间:2023-10-09 23:20
Z(x, y) = 2x sin² y..............................(1)
∂Z/∂x = 2sin² y..................................(2)
∂Z/∂y = 4xsinycosy = 2x sin(2y)........(3)
∂²Z/∂x² = 0 .......................................(4)
∂²Z/∂y² = 4x cos(2y).........................(5)
∂²Z/∂x∂y = 4sinycosy = 2sin(2y).......(6)
求偏导的基本方法是:
对x求偏导时将y看成常数,
对y求偏导时将x看作常数!