MCQ
$\int\frac{\text{x+sin x}}{1+\text{cos x}}\ dx$ is equal to:
- A$\log|1+\cos\text{x}|+\text{c}$
- B$\log|\text{x}+\sin\text{x}|+\text{c}$
- C$\text{x}-\tan+\text{c}$
- ✓$\text{x}.\text{tan}\frac{\text{x}}{2}+\text{c}$
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$7 x+11 y+\alpha z=13$
$5 x+4 y+7 z=\beta$
$175 x+194 y+57 z=361$
has infinitely many solutions, then $\alpha+\beta+2$ is equal to