On the rst page write your name and your student's index number.
Check that the number of your student's index is ODD as only then this is a task for you.
Solving a task from wrong group is worth ZERO points, regardless of solution.
The system accepts only .pdf les, sent withing the given time frame. The rst le sent is , as well,
the nal answer, it is not possible to replace the le.
Let A = (1, 2, −1), B = (0, 3, 1) and C = (2, 2, 5).
a) Find the exact value of the angle AB̂C .
b) Find all points D from the X -axis for which the volume of the tetrahadron ABCD is equal to 4.