trigonometry.py 文件源码

def specialFun1(x):     
    '''(x*sin(x) - 2.*(1.-cos(x)))/(x*x*x*x)'''
    if (abs(x) > 1e-2):         
        return (x*math.sin(x) - 2.*(1. - math.cos(x))) / (x*x*x*x)          
    else:           
        return -1./12. + x*x / 180. - x*x*x*x / 6720.