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157 def _evalf_(self, x, parent=None): 158 """ 159 EXAMPLES:: 160 161 sage: n(sec(pi/4),100) 162 1.4142135623730950488016887242 163 sage: float(sec(pi/4)) 164 1.4142135623730951 165 """ 166 if parent is float: 167 return 1/math.cos(x) 168 return (1 / x.cos())