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The set of values of lambda for which th...

The set of values of `lambda` for which the vectors ` vec a=(lambda(log)_2x) hat i-6 hat j+3 hat ka n d vec b=((log)_2x) hat i+2 hat j+(2lambda(log)_2x) hat k` make an obtuse angle for any `x in (0,oo)` `(0,4/3)` (b) `(-4/3,0)` `(4/3,oo)` (d) `(-4/3,0]`

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