17.73 USE problems
Condition: Calculate the value of the expression: \[ \sin \frac{7 \pi}{3} \cdot \tan \left(-\frac{13 \pi}{6}\right)+\sqrt{2} \cos \left(-\frac{5 \pi}{4}\right)-\cot 13.5 \pi \]
Problems of the USE (Unified State Exam) - equations and inequalities in terms of a parameter, solved both by algebraic methods and geometric ones.