π/2-π/3cos(4x-5π/6)=√3/24x-5π/6=-π/64x=2π/3x=π/6
啊,看到就头疼...
解:4x-5*pi/6=pi/6+2k*pi得x=pi/4+k*pi/2又pi/2故得k=1;x=3*pi/4