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If veca+3vecb=3hati-hatj and 2veca+vecb=...

If `veca+3vecb=3hati-hatj` and `2veca+vecb=hati-2hatj` ,then what is the angle between `veca` and `vecb` ?

A

0

B

`(pi)/(6)`

C

`(pi)/(3)`

D

`(pi)/(2)`

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