Question

A line makes angle a, b, g, d with four diagonals of cube ; then the value of cos²a + cos²b + cos²g + cos²d is

• A. $\frac{2}{3}$
• B. $\frac{4}{3}$
• C. $\frac{1}{6}$
• D. None of these

Answer 1

Answer: (B)

$\frac{4}{3}$

Answer 2

See theory notes.