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 Inequalites in Terms of A Parameter, Solved Both by Algebraic Methods and Geometric One.