如图，求解这两道题，高中数学必修4的内容，急求！！！

显示全部楼层 · 2013-6-17 16:12:39

f(x)=cos(x+?)(cos(x+?)-2cos?cosx)+（c0s?)^2=cos(x+?)(cos?cosx-sinxsin?-2cos?cosx)+（c0s?)^2=cos(x+?)(-cos?cosx-sinxsin?)+（c0s?)^2=(cos?cosx-sinxsin?)(-cos?cosx-sinxsin?)+（c0s?)^2=(sinxsin?)^2-(cos?cosx)^2+（c0s?)^2=(1-（c0sx)...

千问 · 2013-6-17 16:12:39

3/2
1/2
π...