1.

If the angle theta between the vectors bara = 2x^(2)bari +4xbarj+bark and barb= 7bari -2barj + xbark " is such that " 90^(@)lt theta lt180^(@) then x lie in the interval

Answer»

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

ANSWER :A


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