[微積] 偏微分微不出來...
題目是 [sin(x+y)+cos(x+y)]*e^(x-y)
求對 y 做偏微分
我的算法是
{[cos(x+y)+sin(x+y)]+[-sin(x+y)+cos(x+y)]}*-e^(x-y)
= -2cos(x+y)*e^(x-y)
請問是哪裡出差錯了 Q_Q
補充 答案是給 -2sin(x+y)*e^(x-y)
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