cos x/4 *sin П/5-sin x/4+cos П/5=корень из 2 /2

sin(π/5-x/4)=√2/2sin(x/4-π/5)=-√2/2x/4-π/5=-π/4+2πn U x/4-π/5=5π/4+2πnx/4=-π/20+2πn U x/4=29π/20+2πnx=-π/5+8πn U x=29π/5+8πn,n∈z