If vec(a) xx vec(b)= vec(c ) xx vec(d), ...

If `vec(a) xx vec(b)= vec(c ) xx vec(d), vec(a) xx vec(c )= vec(b) xx vec(d)`, then

A

`(vec(a)-vec(d))//(vec(b)-vec(c ))`

B

`(vec(a)-vec(b))//(vec(c )-vec(d))`

C

`(vec(a)-vec(c ))//(vec(b)- vec(d))`

D

`(vec(a) + vec(b))//(vec(c ) + vec(d))`

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A

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