How to use 'python trigonometric functions' in Python

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157def _evalf_(self, x, parent=None):
158 """
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())

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