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If abs(veca)=abs(vecb)=2 & abs(veca+ vec...

If `abs(veca)=abs(vecb)=2 & abs(veca+ vecb)=2abs(veca-vecb)`. Find the angle between `veca & vecb`

A

`sin^-1(3/5)`

B

`sin^-1(4/5)`

C

`tan^-1(1/2)`

D

`pi/3`

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