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Consider any two points on the vector, P = (a, b) and Q = (c, d). And lext x be the angle made by the vector with the positive direction of the x-axis.

Then either a = c, so that the vector is vertical and its direction is straight up or a - c is non-zero.

In that case, tan(x) = (b - d)/(a - c)

or x = tan-1[(b - d)/(a - c)]

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