Sketch f (x) = cos (2x) on the interval [- /2 , /2 ]. Find f (- /12 ) and f (/6) , mark these values on the graph. Does Rolle's theorem apply to this...

f (π/6) , mark these values on the graph. Does Rolle's theorem apply to this function on the interval [-π/12 , π/6 ]. If so , mark on the graph all numbers c on the interval [ -π/12 , π/6 ] and then find all such c. Be sure to leave c in exact form.