A (5, 2) और B (6, -15) को मिलाने वाली रेखा O (0, 0) पर कितना कोण बनाती है?

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

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