когато a  x + ( 3 / x ) и b  x - ( 3 / x ) , ( 2  a  2 ) / ( 2  b  2 ) ?
"- - > ( 2  a  2 ) / ( 2  b  2 )   ( 2 )  ( a  2  b  2 )   2  ( a - b ) ( a + b ) . тъй като a - b  6 / x и a + b  2 x , 2  ( a - b ) .
power(3, add(multiply(3, 3), multiply(3, 3)))