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Agar $\\displaystyle \\lim\\limits_{(x,y)\\to(\\var{a},a)}\\dfrac{\\simplify{x*y-b*y-{a}*x+{a}*b}}{\\simplify{{b}x-{b}*{a}}}=\\var{c}$, maka nilai $a$ dan $b$ berturut-turut adalah $\\ldots$.

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