Question: Find all the points on the graph of the function f ( x ) = 2 cos( x ) + cos 2 ( x )

Find all the points on the graph of the function f(x) = 2 cos(x) + cos2(x) at which the tangent line is horizontal. (Use n as your arbitrary integer and show all the work.)

(x,y)=( ) (smaller y-value)

(x,y)=( ) (larger y-value)

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