Level:
Project ID:
1003085910
Accepted:
1
Clonable:
0
Easy:
0
The solution set of the inequality \( \mathrm{tg}^3x + \mathrm{tg}^2x - \mathrm{tg}\,x - 1 < 0 \) for \( x\in\left(-\frac{\pi}2;\frac{\pi}2\right) \) is:
\( \left(-\frac{\pi}2;\frac{\pi}4\right) \)
\( \left(\frac{\pi}2;\frac{7\pi}4\right) \)
\( \left(-\frac{\pi}2;\frac{3\pi}4\right) \)
\( \left(-\frac{\pi}2;\frac{\pi}2\right) \)