Find-the-angle-between-the-lines-whose-direction-cosines-are-given-by-l-m-n-0-and-l-2-m-2-n-2-0-

Question Number 75521 by vishalbhardwaj last updated on 12/Dec/19

$$\mathrm{Find}\:\mathrm{the}\:\mathrm{angle}\:\mathrm{between}\:\mathrm{the}\:\mathrm{lines} \\ $$$$\mathrm{whose}\:\mathrm{direction}\:\mathrm{cosines}\:\mathrm{are}\:\mathrm{given} \\ $$$$\mathrm{by}\:{l}+{m}+{n}\:=\:\mathrm{0}\:\mathrm{and}\:{l}^{\mathrm{2}} +{m}^{\mathrm{2}} −{n}^{\mathrm{2}} \:=\:\mathrm{0}\:?? \\ $$

Commented by mr W last updated on 12/Dec/19

$${what}\:{are}\:{the}\:{direction}\:{cosines}\:{of} \\ $$$${line}\:\mathrm{1}\:{and}\:{what}\:{are}\:{that}\:{of}\:{line}\:\mathrm{2}? \\ $$$${this}\:{is}\:{not}\:{clear}\:{in}\:{your}\:{question}. \\ $$

Commented by vishalbhardwaj last updated on 12/Dec/19

$$\mathrm{sir}\:\mathrm{question}\:\mathrm{is}\:\mathrm{correct}\:\mathrm{and}\:\mathrm{it}\:\mathrm{is}\:\mathrm{written} \\ $$$$\mathrm{as}\:\mathrm{I}\:\mathrm{have}\:\mathrm{written}\:\mathrm{here} \\ $$

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