17.76 USE problems
condition: Simplify the expression: 1) \( \cot t \cdot \sin (-t)+\cos (2 \pi-t)+5 \), 2) \( \frac{\cot t}{\tan t+\cot t}-\cos ^{2} t \)
Problems of the USE (Unified State Exam) - equations and inequalities in terms of a parameter, solved both by algebraic methods and geometric ones.