12th Class
Mathematics
Sample Paper
Mathematics Olympiad - Sample Paper-5
question_answer
Let \[\vec{a},\text{ }\vec{b}\] and \[\vec{c}\] be three vectors having magnitudes 1, 1 and 2 respectively. If \[\vec{a}\times (\vec{a}\times \vec{c})+\vec{b}=\vec{0}\], then the acute angle between \[\vec{a}\] and\[\vec{c}\]is______.