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### Question Asked by a Student from EXXAMM.com Team

** Q 2200691518. ** A vector `vec(a)` has components `2p` and `1` with respect to a

rectangular cartesian system. This system is rotated

through a certain angle about the origin in the clockwise

sense. If with respect to new system, `vec(a)` has components

`p + 1` and `1`, then