Q. Let $O A BC$ be a regular tetrahedron with side length unity. Angle between skew lines $O A & BC$ be $α$ , angle between skew lines $OB & C A$ be $β$ and angle between skew lines OC \& AB be $γ$ .
$sin^{2} α + sin^{2} β + sin^{2} γ$ is equal to

72 86 Vector Algebra Report Error

0 $\frac{3}{4}$

Solution: