For the surface with parametric equations r(s, t) = (st, s + t, s t),...

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For the surface with parametric equations r(s, t) = (st, s + t, s – t), find the equation of the tangent plane at (2, 3, 1). Find the surface area under the restriction s2 +12 <1 For the surface with parametric equations r(s, t) = (st, s + t, s – t), find the equation of the tangent plane at (2, 3, 1). Find the surface area under the restriction s2 +12 <1