1.

If a and b are mutually perpendicular vectors, then \[{{(\mathbf{a}+\mathbf{b})}^{2}}=\]         [MP PET 1994; Pb. CET 2002]

A.             \[\mathbf{a}+\mathbf{b}\]
B.             \[\mathbf{a}-\mathbf{b}\]
C.             \[{{a}^{2}}-{{b}^{2}}\]
D.             \[{{(\mathbf{a}-\mathbf{b})}^{2}}\]
Answer» E.


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