1.

vec(a),vec(b) and vec( c ) are unit vectors vec(a)xx(vec(b)xx vec( c ))=(vec(b))/(2). The vector vec(a) makes the angle ………, …… with vec(b) and vec( c ) respectively.

Answer»

`40^(@),80^(@)`
`45^(@),45^(@)`
`30^(@),60^(@)`
`90^(@),60^(@)`

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