一、选择题-|||-3.设 =(sin )^2x, 则 ^(n+1)=() .-|||-(A) sin (2x+dfrac (npi )(2)) (B) ^nsin (2x+dfrac (npi )(2))-|||-(C) ^n+1sin (2x+dfrac (npi )(2))-|||-(D) ^nsin (x+dfrac (npi )(2))

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