1.

If vec(a) is vector perpendicular to both vec(b) and vec(c ), then

Answer»

`VEC(a)+(vec(B)+vec(c ))=vec(0)`
`vec(a)xx(vec(b)+vec(c ))=vec(0)`
`vec(a)xx(vec(b)xx vec(c ))=vec(0)`
`vec(a).(vec(b)xx vec(c ))=vec(0)`

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