17.45 Use Problems
Condition: Solve the following equation by lowering the degree. \ [\ cos ^{6} \ left (\ frac {\ pi} {4}+x \ right)+\ cos ^{6} \ left (x- \ frac {\ pi} {4} \ right) = 0.5 \]
Problems of the Use (Unified state Exam) - Equations and Inequalites in Terms of A Parameter, Solved Both by Algebraic Methods and Geometric One.