Teaching EMRS PGT Mock Test 2023 Mathematics Three Dimensional Geometry Angle between two lines

उन रेखाओं के बीच का कोण क्या है, जिनके दिशा अनुपात समीकरण l + m + n = 0 और l2 = m2 + n2 को संतुष्ट करता है?

1
\(\frac{\pi}{2}\)
2
\(\frac{\pi}{3}\)
3
\(\frac{\pi}{4}\)
4
\(\frac{\pi}{6}\)
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