幼稚
发表于 2025-3-28 16:08:27
Polar coordinates, matrices and transformations,xed point, the ., in the plane; for example, ‘50 km from ., bearing 53·1°’ instead of ‘40 km east and 30 km north from .’. Taking the pole to coincide with the origin of a cartesian system, and the ., from which . is measured anti-clockwise, to coincide with the .axis, Fig. 3.1 enables us to convert