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The resultant of vec(A)+vec(B) is vec(R ...

The resultant of `vec(A)+vec(B) is vec(R )_(1)`. On reversing the vector `vec(B)`, the resultant becomes `vec(R )_(2)`. What is the value of `R_(1)^(2)+R_(2)^(2)`?

A

`A^(2)+B^(2)`

B

`A^(2)-B^(2)`

C

`2(A^(2)+B^(2))`

D

`2(A^(2)-B^(2))`

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The correct Answer is:
A
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