prove that vector A=i+2j+3k,and B=2i-j
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Answer:
A and B will be perpendicular to each other if A.B =0
A.B = i + 2j +3k × 2i - j
A .B = 2(i . i ) - 2 (j.j) + 3 (k.0k)
A.B =2-2+0=0
A.B=0
A perpendicular to B
hence proved
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