MCQ
$\int_{}^{} {{\rm{cose}}{{\rm{c}}^2}x\;dx} $ is equal to
- A$\cot x + c$
- ✓$ - \cot x + c$
- C${\tan ^2}x + c$
- D$ - {\cot ^2}x + c$
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$\frac{\sum_{k=1}^{12}\left|\alpha_{k+1}-\alpha_k\right|}{\sum_{k=1}^3\left|\alpha_{4 k-1}-\alpha_{4 k-2}\right|}$ is