weee denominator x-y=0 so hujui hesabu wewee??any number div by zero?is ambiguity so acha kabisa, nimekulia hesabu na nlikuwa nazipenda sana,ukitaka kuthibitisha assume x 0r y= any number say 4.---then 2(4-4)/(4-4)=(4-4)/(4-4) mh?? be careful maths is not maths unless u r a mathematician muzee!!