2010009804

Level: 
Project ID: 
2010009804
Source Problem: 
Accepted: 
0
Clonable: 
1
Easy: 
0
The solution set of the equation \( \mathrm{tg}\, x - \mathrm{cotg}\,x = 0 \) for \( x\in\mathbb{R} \) is:
\( \bigcup\limits_{k\in\mathbb{Z}}\left\{\frac{\pi}4+k\pi;\frac{3\pi}4+k\pi\right\} \)
\( \bigcup\limits_{k\in\mathbb{Z}}\left\{k\pi;\frac{\pi}4+k\pi\right\} \)
\( \bigcup\limits_{k\in\mathbb{Z}}\left\{\frac{\pi}4+k\pi\right\} \)
\( \bigcup\limits_{k\in\mathbb{Z}}\left\{\frac{3\pi}4+k\pi\right\} \)