If (veca + 3 vecb) is perpendicular t...

If ` (veca + 3 vecb)` is perpendicular to ` ( 7 veca - 5 vecb)` and ` ( veca - 4 vecb)` is perpendicular to `( 7 veca - 2 vecb)` , then the angle between ` veca and vecb` ( in degrees ) is ______

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JEE MAINS PREVIOUS YEAR-JEE MAINS 2021-MATHEMATICS (SECTION-B)

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