actl1997
花朵
共回答了22个问题采纳率:95.5% 举报
y=tan(x+2π/3)-tan(x+π/6)+cos(x+π/6)
=tan(x+π/6+π/2)-tan(x+π/6)+cos(x+π/6)
=-1/tan(x+π/6)-tan(x+π/6)+cos(x+π/6)
=cos(x+π/6)-2/sin(2x+π/3)
y'=-sin(x+π/6)+4cos(2x+π/3)/sin(2x+π/3)^2=0
在[-2.5,-1/3]上的解为
x=-1.4024
最小值为2.6735
区间给的不对吧?
1年前
6