Complete the following steps for the gleen function f and interval.a. For the given value of n use sigma notation lo write the let, right and midpoint Riemavn mums. Then evaluate sach num uning a caloulator:b. Rased on the approvimabons found in part ( d ) entruate the avea of the region bounded by the graph of f on the interval.(x)=cos2xlor[0,2]:n=60a. Whese the ief Rienave sum.i=150=1120(6064) (Typean exact anower, using sas needed) The apposination of the let hemavn sum is(Dep not round unel the final avewer. Then round le Trree decimal places as nepded)