MCQ
The curve $y-x:$
- AA vertical tangent $($parallel to $y-$axis$)$
- ✓A horizontal tangent $($parallel to $x-$axis$)$
- CAn oblique tangent
- DNo tangent
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$ x+(\sqrt{2} \sin \alpha) y+(\sqrt{2} \cos \alpha) z=0 $
$ x+(\cos \alpha) y+(\sin \alpha) z=0 $
$ x+(\sin \alpha) y-(\cos \alpha) z=0$
has a non-trivial solution, then $\alpha \in\left(0, \frac{\pi}{2}\right)$ is equal to :