Angle between two lines
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Jan on 2 Jun 2021
Edited: Jan on 2 Jun 2021
This cannot work. There is no realtion between Theta and Phi. Therefore the parameters to define the blue line does not allow to define the red one.
The question would be meaningful (and easy to solve), if the red line is orthogonal to the blue one.
By the way, even if the question contains enough information, you'd have to show us, in which format the line is defined.