17.61 Use Problems
Condition: if \ (\ cot \ alpha =-\ frac {1} {2} \), then the value \ (\ tan \ left (\ frac {3 \ pi} {4} -2 \ alpha \ right) \) is equal?
Problems of the Use (Unified state Exam) - Equations and Inequalites in Terms of A Parameter, Solved Both by Algebraic Methods and Geometric One.