1.

The vectors a→=3i^-2j^+2k^ and b→=-i^-2k^ are the adjacent sides of a parallelogram. The acture angle between its diagonals is _____________.

Answer» The vectors a=3i^-2j^+2k^ and b=-i^-2k^ are the adjacent sides of a parallelogram. The acture angle between its diagonals is _____________.


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