f(x)=cos^2x-sin^2x,则f(2005TT/12)=?我的数学很烂,是在班里倒数的那些.f(x)是以5为周期的奇函数,且f(-3)=1,tana=2,f(20sinacosa)=?2005TT/12=2005 派/12

f(x)为奇函数,x>0,f(x)=sin 2x+cos x,则x 设f(sin x)=3-cos 2x,则f(cos x）=? 若F(sin x)=3-cos 2x 则F（cos x）=? f(cos x)=2-sin 2x,则f(sin x)=? f(x)=cos(2x)+2sin(x)化简 f'(sin^2x)=cos^2x,求f(x)f'((sin^x)^2)=(cos^x)^2 若f(cos x)=cos 2x,则f(sin 15度）的值? 已知f(x)=cos(x/2)[sin(x/2)-cos(x/2)],其导为? f(x)=cos(2兀-x)cos(2/兀-x)-sin方x化简速求 若函数f(x)=sin(x+α)-2cos(x-α)是奇函数,则sinαcosα= f(sin x)=3-cos 2x,求f(cos x)=? 化简：f(x)=sin(x)cos(x)/sin(2x) f(sin x)=cos 2x +1 求 f(cos x) f(sin x)=3-cos 2x求f(cos x) 当x=a时,f（x）=sin x - 2cos x取得最大值,则cos a =? 设函数f(x)=p·q,其中向量p=(sin x,cos x+sin x),q=(2cos x,cos sin x) ( 一道 三角题 急求解题过程设f(x)满足2f(sin x)+3f(cos x)=2cos x,则f(x)=______. f(x)=(6sin^4x-7sin^2x+2)/(sin^2x-cos^2x)