[0/2 Points] DETAILS PREVIOUS ANSWERS SESSCALC2 2.5.051. MY NOTES PRAC Find all 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.) ( x, y ) = x (smaller y-value) ( x, y ) = x (larger y-value)