(a) If a1 , b1 , c1 and a2 , b2, c2 are the direction ratios of two lines, then write the condition of its perpendicularity.
(b) Find the angle between the lines
\(\frac{x+3}{3}=\frac{y-1}{5}=\frac{z+3}{4}\) and
\(\frac{x+1}{1}=\frac{y-4}{1}=\frac{z-5}{2}\)
