Using this linear approximation, approximate the value of {{MATH_5}}. {{CMD_6}} We have to express {{MATH_7}} as {{MATH_8}}, for some value of {{MATH_9}}. {{CMD_10}} {{CMD_11}} It follows that {{MATH_12}}. {{CMD_13}} {{CMD_14}} It follows that {{MATH_15}}. {{CMD_16}} {{MATH_17}}