1.

Let a = sin^2 x hati + cos^2 x hatj + hatk ,( x in R). If the pairs of vectors a , hati , a , hatj and a , hatk are adjacent sides of 3 distinct parallelograms and A is the sum of the squares of areas these parallelograms ,then A lies in the interval

Answer»

`(0 , 1)`
`(3, 4)`
`(0 , 2)`
`(1, 2)`

Answer :B


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