The angle between the lines whose direction cosine are connected by the relations l –5m+3n=0 and 7 l^2 + 5m^2 – 3

### Question Asked by a Student from EXXAMM.com Team

Q 2271267126.     The angle between the lines whose direction cosine are connected by the relations l –5m+3n=0 and 7 l^2 + 5m^2 – 3n^2 = 0
A

tan^(-1)(2/ sqrt3)

B

cos^(-1)sqrt(7/(12))

C

cos^(-1)sqrt(3/7)

D

tan^(-1)(5/7)`

#### HINT

(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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