用numpy计算比较方便，虽然math里也有，但是math的输入值必须是单个数，不能是list或者array

>>> import numpy as np
# x可以是list或者np.ndarray
# cos(x)
>>> np.cos(x)
# sin(x)
>>> np.sin(x)
# tan(x)
>>> np.tan(x)
# acrcos(x)
>>> np.arccos(x)
# acrsin(x)
>>> np.arcsin(x)
# acrtan(x)
>>> np.arctan(x)
# cosh(x)
>>> np.cosh(x)
# sinh(x)
>>> np.sinh(x)
# tanh(x)
>>> np.tanh(x)

math里基本上都有了

>>> import math
# cos(x)
>>> math.cos(x)

# sin(x)
>>> math.sin(x)

# tan(x)
>>> math.tan(x)

# acrcos(x)
>>> math.acos(x)

# acrsin(x)
>>> math.asin(x)

# acrtan(x)
>>> math.atan(x)

# cosh(x)
>>> math.cosh(x)

# sinh(x)
>>> math.sinh(x)

# tanh(x)
>>> math.tanh(x)