Original
On the interval {{MATH_49}} {{MATH_50}} is {{CMD_51}}{{CMD_52}}increasing{{CMD_53}}{{CMD_54}}decreasing{{CMD_55}}{{CMD_56}}not defined{{CMD_57}}{{CMD_58}} and {{CMD_59}}{{CMD_60}}concave up{{CMD_61}}{{CMD_62}}concave down{{CMD_63}}{{CMD_64}}not defined{{CMD_65}}{{CMD_66}}.