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Its simple
determinant nethod
cross product is given by
=i   j   k
ax  ay az
bx  by  bz
we will use i,j,k one by one
when i is chosen its corresponding row and column become bound and remaining elements are subtracted after cross multiplication
so i(aybz-byaz)is component along i
similarly in j,
component is axbz-bxaz
same argument for k also
1 5 1
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