Remove INF/INF case

Author: manoj-km24

Lib/test/test_cmath.py

@@ -517,7 +517,6 @@ def test_isinf(self):
         self.assertFalse(cmath.isinf(NAN))
         self.assertTrue(cmath.isinf(INF))
         self.assertTrue(cmath.isinf(-INF))
-        self.assertFalse(cmath.isinf(INF/INF))
         self.assertTrue(cmath.isinf(complex(INF, 0)))
         self.assertTrue(cmath.isinf(complex(0, INF)))
         self.assertTrue(cmath.isinf(complex(INF, INF)))