CBSE Class 12-science Answered
prove that
Asked by | 20 Feb, 2009, 05:39: PM
Expert Answer
we know that a.b = |a| |b| cosθ
squaring both the sides
(a.b)2 = |a|2 |b|2 cos2θ
now cos2θ 
1
==> (a.b)2 |a|2 |b|2
Answered by | 20 Feb, 2009, 09:23: PM
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