MCQ
The vectors $a, b $ and $ a + b $ are
- ACollinear
- ✓Coplanar
- CNon-coplanar
- DNone of these
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$(A)$ $f$ has a local maximum at $x=2$
$(B)$ $f$ is decreasing on $(2,3)$
$(C)$ there exists some $c \in(0, \infty)$ such that $f ^{\prime \prime}( c )=0$
$(D)$ $f$ has a local minimum at $x=3$