How do you sketch the graph of $f(θ)=2cosθ+cos2 θ$ for $0≤x≤ 2π$ using the first and second derivative?

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Answer 1 · 2015-03-23T14:37:08

Ok, have a look...my graph is not very nice and please check my maths!
enter image source here

How do you sketch the graph of f(θ)=2cosθ+cos2 θf(θ)=2cosθ+cos2 θ for 0≤x≤ 2π0≤x≤ 2π using the first and second derivative?