f(x)=x^3-3x^2+2x-7f'(x)=3x^2-6x+23x^2-6x+2=0k=-3D/4=9-6=3x=(3+<span>√3)/3x=(3-<span>√3)/3 + - +</span>----(3-<span>√3)/3-----(3+<span>√3)/3-------></span></span> возрастает на (-беск;(3-<span>√3)/3]U[(3+<span>√3)/3;+беск)</span></span>убывает на [(3-<span>√3)/3;(3+<span>√3)/3]</span></span> </span>
<span> сosx=1/2</span>