The angle between the lines \(\frac{x-5}{7}=\frac{y+2}{-5}=\frac{z-3}{1}\) and \(\frac{x}{1}=\frac{y}{2}=\frac{z+1}{3}\) is

0 \(\pi\) \(\frac{\pi}{2}\) \(\frac{\pi}{3}\)

\(\frac{\pi}{2}\)

product of corresponding direction ratios and then add, we have 0