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Let vecr=(veca xx vecb)sinx+(vecb xx vec...

Let `vecr=(veca xx vecb)sinx+(vecb xx vec c)cosy+2(vec c xx vec a)`, where `veca, vecb, vec c` are non-zero and non-coplanar vectors. If `vecr` is orthogonal to `veca+vecb+vec c`, then find the minimum value of `(4)/(pi^(2))(x^(2)+y^(2))`.

A

`pi^(2)`

B

`(5pi^(2))/(4)`

C

`(35pi^(2))/(4)`

D

`(37pi^(2))/(4)`

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The correct Answer is:
B, D
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