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[latexpage] $f_x(x_0,y_0)=\lim_{\Delta x \rightarrow 0} \frac{f(x_0+\Deltax,y_0)-f(x_0,y_0)}{\Delta x}$   Bagi mereka (disediakan) darussalam (surga) pada sisi Tuhannya dan Dialah Pelindung mereka disebabkan amal-amal saleh yang selalu mereka kerjakan

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