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The non zero vectors veca,vecb, and vecc...

The non zero vectors `veca,vecb, and vecc ` are related byi `veca=8vecb nd vecc=-7vecb.` Then the angle between `veca and vecc` is (A) `pi` (B) 0 (C) `pi/4` (D) `pi/2`

A

`pi`

B

0

C

`pi/4`

D

`pi/2`

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A
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