is cos^2x the same as cosx^2（関連順）

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Prove that `cos 2xcosx/2-cos 3x cos(9x/2)= sin5x sin(5x)/2` ....

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Prove that Cos(2x)*Cos(x/2)-Cos(3x)*Cos(9x/2)=Sin(5x)*Sin(5x/2) ,Trigonometry product sum formula

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prove that Cos2x cos(x/2)−cos3xcos(9x/2)=sin5xsin(5x/2) ||

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結果 : is cos^2x the same as cosx^2