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If the angle between the vectors x hat i...

If the angle between the vectors `x hat i+3 hat j-7 hat k\ a n d\ x hat i-x hat j+4 hat k` acute, then `x` lies in the interval `(-4,7)` b. `[-4,\ 7]` c. `R-[-4,7]` d. `R-(4,7)`

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