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Question

If a=(5^i^j+3^k) and b=(^i+3^j5^k) then show that (a+b) and (ab) are orthogonal.

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Solution

Given
a=5^i^j+3^k and b=^i+3^j5^k
a+b=6^i+2^j2^k and ab=4^i4^j+8^k
For orthogonality (a+b).(ab)=0
(a+b).(ab)=6×4+2×(4)+(2)×8=0
Hence proved that the vectors(a+b) and (ab) are orthogonal

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