Question

If \(\theta\) is angle between the lines \(\frac{x}{1}=\frac{y+1}{2}=\frac{z-1}{3}\) and \(\frac{x+1}{3}=\frac{y}{2}=\frac{z}{1}\), then \(\cos\theta=\)

• A. \(\frac{5}{9}\)
• B. \(\frac{5}{8}\)
• C. \(\frac{5}{6}\)
• D. \(\frac{5}{7}\)
• E. \(\frac{6}{7}\)

Answer 1

The Correct Option is D

The correct option is (D) : \(\frac{5}{7}\)