MCQ
$i\,.\,(j \times k) + j\,.\,(k \times i) + k\,.\,(i \times j) = $
- A$1$
- ✓$3$
- C$-3$
- D$0$
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$f(x)= \begin{cases}\operatorname{a} \sin \frac{\pi}{2}(x-1), & \text { for } x \leq 0 \\ \frac{\tan 2 x-\sin 2 x}{b x^{3}}, & \text { for } x>0\end{cases}$
If $f$ is continuous at $x=0$, then $10-a b$ is equal to ...... .