Question

give answer as soon as possible.
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Answer 1

Answer:

A × B denotes the vector cross product of vectors A and B. The Pythagorean trigonometric identity then provides:

||A×B||²+(A.B) ²=|A|²|B|²

||A×B||²+12²=100×4

|A×B|=√(400-144) =√256=16