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\n\n\n\n| $(a,b)$ | \n$f$ | \n$g$ | \n$f_x$ | \n$f_y$ | \n
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\n\n| $(1,2)$ | \n$\\var{a}$ | \n$\\var{b}$ | \n$\\var{c}$ | \n$\\var{d}$ | \n
\n\n
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