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\textLet S \text be the set of all a \in \mathbbR \text for which the angle between the vectors \vecu=a(\log_e b),\hati-6\hatj+3\hatk \text and \vecv=(\log_e b),\hati+2\hatj+2a(\log_e b),\hatk,\ (b>1), \text is acute. Then S \text is equal to: | Watch the step-by-step video solution for this NIMCET PYQ.