If \(\vec a + \vec b + \vec c = \vec 0,\;|\vec a| = 3,\;|\vec b| = 5\) and \(|\vec c| = 7\), find the angle between \(\vec a\) and \(\vec b\).

1
π / 2
2
π / 3
3
π / 6
4
π / 4

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