On the interval {{MATH_31}} {{MATH_32}} is {{CMD_33}}{{CMD_34}}increasing{{CMD_35}}{{CMD_36}}decreasing{{CMD_37}}{{CMD_38}}not defined{{CMD_39}}{{CMD_40}} and {{CMD_41}}{{CMD_42}}concave up{{CMD_43}}{{CMD_44}}concave down{{CMD_45}}{{CMD_46}}not defined{{CMD_47}}{{CMD_48}}.