MathematicsMedium202×since 2002Q5719Let a→\overrightarrow aa, b→\overrightarrow bb and c→\overrightarrow cc be three unit vectors, out of which vectors b→\overrightarrow bb and c→\overrightarrow cc are non-parallel. If α\alphaα and β\betaβ are the angles which vector a→\overrightarrow aa makes with vectors b→\overrightarrow bb and c→\overrightarrow cc respectively and a→\overrightarrow aa ×\times× (b→\overrightarrow bb ×\times× c→\overrightarrow cc) = 12b→{1 \over 2}\overrightarrow b21b, then ∣α−β∣\left| {\alpha - \beta } \right|∣α−β∣ is equal to :A90^oB30^oC45^oD60^oCheck answerSkip