(SIN2X)^2+SIN2X+COS2X=1求角X
问题描述:
(SIN2X)^2+SIN2X+COS2X=1求角X
答
sin²2x+sin2x+cos2x=1sn2x+cos2x=1-sin²2x=cos²2xsin2x=cos²2x-cos2x ---------------------------------------------(1)(sin2x)²=(cos²2x-cos2x)²sin²2x=(cos²...