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(1) Find an equation of the tangent line to the curve x - xy + 2y3 = -2 at the point (2,1). 13 12
(5) Find an equation of the tangent line to the curve r* - xy + 3y = 11 at the point (1,2).
(10) Find an equation of the tangent line to the curve r? - x*y+ 2y2 = 7 at the point (-1,2).