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I'm doing r^2 = x^2 + y^2, which I find r = sqrt(18) = 3radical(2)

tan(theta) = 3/-3 = 1, so theta = -pi/4 = 7pi/4.

z = 3

Cylindrical coordinates are (3sqrt(2),7pi/4,3).

Is this right? Correct answer to the homework says 3pi/4 for the angle, for some reason.