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The value of c so that for all real x, t...

The value of c so that for all real x, the vectors `cxhatk + 3hatj, xhati + 2hatj + 2cx hatk` make an obtuse angle are:

A

`c lt 0`

B

`0 lt c lt 4//3`

C

`-4//3 lt c lt 0`

D

`c gt 0`

Text Solution

Verified by Experts

The correct Answer is:
D
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