Chứng minh 1- cos 2x / sin 2x = tan x
Giải thích
1−cos2xsin2x=1−2cos2x−12sinx.cosx=2−2cos2x2sinx.cosx=21−cos2x2sinx.cosx=2.sin2x2sinx.cosx=sinxcosx=tanx
1−cos2xsin2x=tanx
1−cos2xsin2x=1−2cos2x−12sinx.cosx=2−2cos2x2sinx.cosx=21−cos2x2sinx.cosx=2.sin2x2sinx.cosx=sinxcosx=tanx
1−cos2xsin2x=tanx