Consider the graph of the function {{MATH_104}}. {{CMD_105}} {{ENV_106}} {{CMD_107}} The function {{MATH_108}} has four local extremums: at {{MATH_109}}, {{MATH_110}}, {{MATH_111}} and {{MATH_112}}. Notice that the function {{MATH_113}} is {{CMD_114}}not differentiable{{CMD_115}} at {{MATH_116}} and {{MATH_117}}. Notice that {{MATH_118}} and {{MATH_119}}.