|xcos x - ysin y|=(|xcos y-ysin x|mod(x,0.89)+0.1)mod(1+89+89) |xcos x - ysin y|=(|xcos y-ysin x|mod(x,0.89)+0.1)mod(1+89+89)x2 |xcos x - ysin y|=(|xcos y-ysin x|mod(x,0.89)+0.1)mod(1+89+89)3 |xcos x - ysin y|=(|xcos y-ysin x|mod(x,0.89)+0.1)mod(1+89+89)5