2*cos11π/56*cos3π/56
Пошаговое объяснение:
cosπ/8+cosπ/14=2*cos(π/8+π/14)*cos(π/8-π/14)=2*cos11π/56*cos3π/56
2*cos11π/56*cos3π/56
Пошаговое объяснение:
cosπ/8+cosπ/14=2*cos(π/8+π/14)*cos(π/8-π/14)=2*cos11π/56*cos3π/56