1.

If the vectors bara = (lambda log_(2) x) bari - 6barj + 3bark and barb = (log_(2) x)bari - 2barj + (2lambda log_(2) x) bark contain an obtuse angle for all xgt0 , " then find the range of "lambda.

Answer»

`(0,4/3)`
`(-4/3,OO)`
`(-4/3,0)`
`(-oo,-4/3)`

ANSWER :C


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