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The resultant of two vectors vecA and ve...

The resultant of two vectors `vecA` and `vecB` is perpendicular to the vector `vecA` and its magnitude is equal to half of the magnitude of the vector `vecB`. Find out the angles between `vecA` and `vecB`.
.

A

`120^(@)`

B

`150^(@)`

C

`135^(@)`

D

`180^(@)`

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