Show that the lines whose direction cosines are given by `l+m+n=0`,
`2mn+3nl-5lm=0` are perpendicular to each other .

Show that the lines whose d.c's are given by l + m + n = 0,2mn + 3nl - 5ln = 0 are perpendicular to each other.

Show that the pair of lines whose direction cosines are given by 3lm-4ln+mn=0 and l+2m+3n=0 are perpendicular to each other.

Show that the pair of lines whose direction cosines are given by 3 lm-4ln+mn =0 and l+2m+3n = 0 are perpendicular to each other.

Prove that the two lines whose direction cosines are connected by the equations l+2m+3n=0, 3lm-4ln+mn=0 are perpendicular to each other.

Find the angle between the lines whose direction cosines are given by : 2l-m+2n=0, mn+nl+lm=0 .

Prove that the lines whose directioncosines are given by the equtions l+m+n=0 and 3lm-5mn+2nl=0 are mutually perpendicular.

The angle between the lines whose directionn cosines are given by 2l-m+2n=0, lm+mn+nl=0 is

The angle between the lines whose directionn cosines are given by 2l-m+2n=0, lm+mn+nl=0 is