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If a=lamdahati+2hatj+2hatkandb=2hati+2ha...

If `a=lamdahati+2hatj+2hatkandb=2hati+2hatj+lamdahatk` are at right angle, then the value of `|a+b|-|a-b|` is

A

2

B

1

C

0

D

-1

Text Solution

Verified by Experts

The correct Answer is:
B
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