MCQ
If $\tan ^{-1} x=y$, then
- A-1 < y<1
- B$\frac{-\pi}{2} \leq y \leq \frac{\pi}{2}$
- C$\frac{-\pi}{2}$ < y < $\frac{\pi}{2}$
- D$y \in\left\{\frac{-\pi}{2}, \frac{\pi}{2}\right\}$
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$\overrightarrow{ a }=\hat{ i }+\hat{ j }+ n \hat{ k }, \quad \overrightarrow{ b }=2 \hat{ i }+4 \hat{ j }- n \hat{ k } \quad$ and $\overrightarrow{ c }=\hat{ i }+ n \hat{ j }+3 \hat{ k } \quad( n \geq 0),$ is $158 cu. Units$, then