Cos2x+sinx/√sin(x–pi/4)=0

Question

Cos2x+sinx/√sin(x–pi/4)=0

Answer 1

Sinx+√2sin(pi/4-2x)=cos2x, sinx+cos2x-sin2x=cos2x,
sinx*(1-2cos x)=0
1) sin x=0;
2) cos x=1/2



Я не уверена.(