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    				| 1. | निम्नलिखित रेखा युग्मों के बीच कि कोण ज्ञात कीजिये| (i) `(x+4)/3 = (y-1)/1 = (z-3)/8` (ii) `(x-2)/2 = (y-1)/5 = (z+3)/-3` and `(x+2)/-1 = (y-4)/8 = (z-5)/4` | 
| Answer» (i) `cos^(-1) 2/3`, (ii) `cos^(-1) 26/(9sqrt(38))` | |