Please help me with those problems

8:30 89 Photo Done The 3rd degree Taylor polynomial for cos x centered a = N 7 - is given by, cos x = - + 8 ( 20 - ? ) " + Rs ( 2 ) . Using this, estimate cos 88 correct to five decimal places. + 38:30 89 Photo Done Consider the function. f(x) = x sin x, a = 0, n = 4, - 0.6