Find the angle between the lines `[x-2]/2=[y-1]/5=[z+3]/-3` and `[x+2]/-1=[y-4]/8=[z-5]/4`

Find the angle between the lines x/2=y/2=z/1 and [x-5]/4=[y-2]/1=[z-3]/8

Find the angle between the lines x+3/3=y-1/5=z+3/4 and x+1/1=y-4/1=z-5/2

Find the angle between the pair of lines (x-2)/2=(y-1)/5=(z+3)/(-3) and (x+2)/(-1)=(y-4)/8=(z-5)/4

Find the angle between the lines (x-3)/2=(y-5)/3=(z+5)/4 and (x+3)/1=(y-4)/2=(z-5)/1 .

Find the angle between the lines (x-1)/(2)=(y-2)/(3)=(z-3)/(4) and (x-2)/(3)=(y-4)/(4)=(z-5)/(5)

Find the angle between the following pair of lines: (x-2)/2=(y-1)/5=(z+3)/-3 and (x+2)/-2=(y-4)/8=(z-5)/4 .

Find the angle between the pair of lines (x-5)/7=(y+2)/(-5)=z/1 and x/1=y/2=z/3

Find the angle between the planes 2x-3y+4z=1 and -x+y=4 .