1.

The vectors vec(a) and vec(b) are not perpendicular and vec(c ) and vec(d) are two vectors satisfying vec(b) xx vec(c )= vec(b) xx vec(d) and vec(a).vec(d)= 0. Then the vector vec(d) is equal to

Answer»

`VEC(B)+ ((vec(b).vec(C ))/(vec(a).vec(b))) vec(c )`
`vec(b) + ((vec(b).vec(c ))/(vec(a).vec(b))) vec(c )`
`vec(b)- ((vec(b).vec(c ))/(vec(a).vec(b))) vec(c )`
`vec(c )-((vec(a).vec(c ))/(vec(a).vec(b))) vec(b)`

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