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Question Number 73274 by peter frank last updated on 09/Nov/19

Commented by kaivan.ahmadi last updated on 09/Nov/19

$$t=0\Rightarrow x=1,y=0\Rightarrow$$$$\frac{\partial f}{\partial t}=\frac{\partial f}{\partial x}\times \frac{\partial x}{\partial t}+\frac{\partial f}{\partial y}\times \frac{\partial y}{\partial t}=$$$$(siny+e^{x}cosy)\left(2t\right)+(xcosy-e^{x}siny)\left(2t\right){\mid }_{t=0}=$$$$e\times 0+(1-0)\left(0\right)=0$$

Commented by peter frank last updated on 09/Nov/19

$$thankyou$$

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