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Kemiringan garis singgung kurva yang merupakan hasil perpotongan dengan permukaan $z=\\dfrac{1}{\\var{a}x^2+y^2-9}$ dengan bidang $y=1$ pada titik $\\left(1,1,-\\dfrac{1}{\\var{8-a}}\\right)$ adalah $\\dfrac{\\var{2*a}}{a}$ dengan $a=\\ldots$.

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