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Given two real numbers x and y, how many solutions are there for tan theta = y/x, theta element of [0, 2pi)? what additional information about x and/or y would make the solution unique? (b) given two planar vectors, (xi, yi) and (x2, y2), find their dot product and cross product (treating the z component as 0).

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Given two real numbers x and y, how many solutions are there for tan theta = y/x, theta element of [...
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