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If vector (veca+ 2vecb) is perpendicular...

If vector `(veca+ 2vecb)` is perpendicular to vector `(5veca-4vecb)`, then find the angle between `veca and vecb`.

A

`60^(@)`

B

`90^(@)`

C

`45^(@)`

D

None

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Verified by Experts

The correct Answer is:
A
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