Find the values of 'a' for which the vector `vec( r )=(a^(2)-4)hati+2hatj-(a^(2)-9)hatk` makes acute angles with the co-ordinate axes.
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The correct Answer is:
`a in (-3,-2)uu(2,3)`
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KUMAR PRAKASHAN-VECTOR ALGEBRA -Practice Paper - 10 (Section-D)
