Giai cac phuong trinh luong giac sau a) cotx-1=(cos2x)/(1+tanx)+sin^2x-1/2sin2x b) cotx-tanx+4sin2x=2/(sin2x)sin 2x c) sin^2(x/2-π/4)tan^2x-cos^2x/2=0 相关知识点: 试题来源: 解析 http://gallery.fbcontent.cn/latex?decode=false&latex=%24%24%5Cbegin%7Barray%7D%7B...