设f( θ)=2cos^3θ + sin^2 (2π-θ)+cos(-θ)-3 / 2+2cos^2(π+θ) + cos(2π-θ),则 f(π/3) =

来源：学生作业帮助网编辑：六六作业网时间：2024/12/25 21:16:36

设f(θ)=2cos^3θ+sin^2(2π-θ)+cos(-θ)-3/2+2cos^2(π+θ)+cos(2π-θ),则f(π/3)=设f(θ)=2cos^3θ+sin^2(2π-θ)+cos(-θ

设f( θ)=2cos^3θ + sin^2 (2π-θ)+cos(-θ)-3 / 2+2cos^2(π+θ) + cos(2π-θ),则 f(π/3) =
设f( θ)=2cos^3θ + sin^2 (2π-θ)+cos(-θ)-3 / 2+2cos^2(π+θ) + cos(2π-θ),则 f(π/3) =

设f( θ)=2cos^3θ + sin^2 (2π-θ)+cos(-θ)-3 / 2+2cos^2(π+θ) + cos(2π-θ),则 f(π/3) =
f( θ)=2cos^3θ + sin^2 (2π-θ)+cos(-θ)-3 / 2+2cos^2(π+θ) + cos(2π-θ),
=2cos³θ +sin²θ +cosθ -3 /2+2cos²θ +cosθ
f(π/3) =[2(1/2)³+3/4+1/2-3]/[2+2(1/2)²+1/2]
=(-3/2)/(3)
=-1/2