y=2*sin^2 x-sin2x-1
=-cos2x-sin2x
=-√2sin(2x+π/4)
T=2π/2=π��ת�������Һ������������ԣ�y=2*sin^2 x-sin2x-1 =-cos2x-sin2x =-��2cos(2x+��/4)T=2��/2=��