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36. The straight lines whose direction cosines are given by al+bm+can=0, fmn+gnl+hlm=0 are perpendicular if (1) f/a + g/b + h/c =0 (2) a/f + b/g + c/h =0 (3) af = bg = ch (4) a/f =b/g = c/h |
| Answer» 36. The straight lines whose direction cosines are given by al+bm+can=0, fmn+gnl+hlm=0 are perpendicular if (1) f/a + g/b + h/c =0 (2) a/f + b/g + c/h =0 (3) af = bg = ch (4) a/f =b/g = c/h | |