Решите уравнение \(\ctg x=-1.\)

• \(\frac{3\pi}{4}+\pi{n}, n\in Z\)
• \(\frac{\pi}{4}+2\pi{n}, n\in Z\)
• \(\frac{5\pi}{4}+\pi{n}, n\in Z\)
• \(-\frac{\pi}{4}+2\pi{n}, n\in Z\)