1.

Let vec r = (veca xx vecb) sin x + (vecb + vec c) cos y+ 2 (vec c xx vec a)where veca , vecb , vec care three non coplanar vectors . If vec r is perpendicular to veca + vecb + vec c , the minimum value of x^2 + y^2is

Answer»

`pi^2`
`(pi^2)/(4)`
`(5pi^2)/(4)`
NONE of these

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