Examine whether or not these pair of lines are perpendicular to each other. (1) y - 3x - 2 = 0 and 3y + x + 9 = 0 (2) 3y - 4 = 2x + 3 and y-5 = x+ 6 (3) Find the equations of the tangent and normal to the curve xsquare + ysquare+3xy-11 = 0 at the point x = 1, y = 2.
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