Find the value of c for which the vectors `vec(a)=(c log_(2)x)hati-6hatj+3hatk` and `vec(b)=(log_(2)x)hati+2hatj+(2c log_(2)x)hatk` makes an obtuse angle for any `(x in 0, oo)`.
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The correct Answer is:
`C in (-(4)/(3),0)`
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KUMAR PRAKASHAN-VECTOR ALGEBRA -Practice Paper - 10 (Section-D)
