関連ワード:  is sin 2x 1 cos2x    is sin 2x 1 cos2x 2    does sin 2x 1 cos2x    is sin 2x cos 2x 1 an identity    is sin 2x equal to 1 cos 2x    sin 2x 1 cos2x 2 proof    sin 2x 1 cos2x tan x    sin 2x 1 cos2x 2 identity    what is sin 2x cos 2x 1 called    what is cos2x - sin2x