Last Updated：2025/11/20
The mathematician located a focal of the cone, one of the two lines perpendicular to the axis whose cosine of the angle with the axis equals the ratio of the cosines of the semiangles.
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The mathematician located a focal of the cone, one of the two lines perpendicular to the axis whose cosine of the angle with the axis equals the ratio of the cosines of the semiangles.
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