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(60) Find the point of intersection of the tangent lines to the curve a ty -3x + 3y- ry = 18 at the points where the curve crosses the r-axis. Answer: ( ). (61) Find the equation of the tangent line to the curve asing + 13 = arctaney +x - = at the point (1, 0). Answer: y = ar + b where a = and b =