question_answer

Let \[\vec{a},\,\vec{b}\] and \[\vec{c}\] be three unit vectors, out of which vectors \[\vec{b}\] and \[\vec{c}\] are non-parallel. If \[\alpha \] and \[\beta \] are the angles which vector \[\vec{a}\] makes with vectors \[\vec{b}\] and \[\vec{c}\] respectively and  then \[|\alpha -\beta |\] is equal to

Answer:

\[30{}^\circ \]