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If the projection of veca on vecb and...

If the projection of `veca` on `vecb` and projection of `vecb` on `veca` are equal, then the angle between `veca+vecb` and `veca-vecb` is :

A

`(pi)/(2)`

B

`(pi)/(3)`

C

`(pi)/(4)`

D

`(2pi)/(3)`

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The correct Answer is:
A
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