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Classification of calculating included angle range in senior high school mathematics
The included angle range of vectors is 0, π.

The included angle range (0, π/2) of two straight lines in analytic geometry is not studied.

In solid geometry, the included angle of two straight lines in space is [0, π/2], and the included angle of parallel straight lines is 0.

In solid geometry, the included angle between two planes in space ranges from 0, π.