Convert (4, –2) into approximate polar coordinates.

Use r = √(x² + y²): √(4² + (−2)²) = √20 ≈ 4.47. The angle is θ = arctan(y/x) = arctan(−2/4) ≈ −0.46 radians, so the approximate polar coordinates are r = 4.47 and θ = −0.46.

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