MCQ
Evaluate $\lim _{x \rightarrow \pi} \frac{1+\cos x}{\tan ^2 x}:$
- A$-\frac{1}{2}$
- B$0$
- ✓$\frac{1}{2}$
- D$1$
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$I$. $\left(\sum_{k=1}^{2018} k x_k\right)^2 \leq N\left(\sum_{k=1}^{2018} k x_k^2\right)$
$II$. $\left(\sum_{k=1}^{2018} k x_k\right)^2 \leq N\left(\sum_{k=1}^{2018} k^2 x_k^2\right)$ Then,