1.

Ifveca,vecb, veccare three non-coplanar vectors such thatvecaxx(vecbxx vecc)=(vecb+vecc)/(sqrt(2))then the angle betweenvecaandvecbis ________.

Answer»

` (pi)/(6) `
` (pi)/(4) `
` (pi)/(2) `
` (3PI)/(4) `

ANSWER :a


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