Therefore, {{MATH_318}} is {{CMD_319}} {{CMD_320}}increasing{{CMD_321}} {{CMD_322}}decreasing{{CMD_323}}{{CMD_324}} on {{MATH_325}}. On the interval {{MATH_326}}, the derivative {{MATH_327}} does not change the sign. Since {{MATH_328}}, it follows that {{MATH_329}} is {{CMD_330}}{{CMD_331}}increasing{{CMD_332}} {{CMD_333}}decreasing{{CMD_334}}{{CMD_335}} on {{MATH_336}}.