1.

7. Show that (A+B) x((A-B)=2(AxB)

Answer»

(a+b)×(a-b)=a×a -b×b +b×a -a×b

=0 -0 +2(b×a)

=2(b×a)

[wherea×ais equal to zero as the angle of a vector to itself is zero and-(a×b)=(b×a).]



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