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Let veca and vecb be two unit vectors if...

Let `veca` and `vecb` be two unit vectors if the vectors `vec c=hata +hat2b` and `vecd=5 hata -4hatb` are perpendicular to each other then the angle between `hata` and `hatb` is

A

`(pi)/(6)`

B

`(pi)/(2)`

C

`(pi)/(3)`

D

`(pi)/(4)`

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The correct Answer is:
C
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