関連ワード:  is sin 2x 2sinxcosx    is sin 2x equal to 2sinxcosx    is sin 2x the same as 2sinxcosx    why does 2sinxcosx = sin2x    how does 2sinxcosx=sin2x    what is 2sinxcosx equal to  
結果 : is sin 2x 2sinxcosx