Question
Fri February 20, 2009 By:

prove that

Expert Reply
Fri February 20, 2009

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

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