関連ワード:  is sin 2x 2sinx    is sin 2x 2sinxcosx    does sin 2x 2sinx    is sin 2x and 2sinx the same    is sin x 2 2sin x    is sin 2x equal to 2sinx    is sin 2x equal to 2sinxcosx    is sin 2 x the same as 2sinx    is sin 2x the same as 2sinxcosx    does sin2x equal 2sinx