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156         self.assertRaises(TypeError, math.acosh)
157 self.ftest('acosh(1)', math.acosh(1), 0)
158 self.ftest('acosh(2)', math.acosh(2), 1.3169578969248168)
159 self.assertRaises(ValueError, math.acosh, 0)
160 self.assertRaises(ValueError, math.acosh, -1)
161 self.assertEqual(math.acosh(INF), INF)
162 self.assertRaises(ValueError, math.acosh, NINF)
163 self.assertTrue(math.isnan(math.acosh(NAN)))