30. Find the values of alfha and u if the vectors 2 i - 3j - 6k and 3i - uj-2k are mutually
perpendicular vectors of equal magnitude.
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If vectors are mutually perpendicular,then
( 2i - 3j - 6k )( 3i - uj-2k ) = 0
6 + 3u + 12 = 0
u = - 6
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