Python 数学模块显示完全错误的结果？

Question

我不知道我做错了什么。

from math import *
# triangle Law of Sines test:
a = float(3)
b = float(3)
c = 4.24264

A = float(45)
B = float(45)
C = float(90)

# it should be equal to the diameter of the triangle's 
# ...circumcircle when convert radians to degrees (2.12132) :
print a /sin(A)
print c /sin(C)

# and just test angles :
print degrees( sin( float(45) ) ) # 'SHOULD BE 2.8284'
print degrees( sin( float(90) ) ) # 'SHOULD BE 1'

...以及打印输出:

>> 3.52566408941
>> 4.74570003753
>> 48.7531807286
>> 51.2222357231

Answer 1

您应该执行以下操作:

sin(radians(90)) 

radians将给定角度从度数转换为弧度，并且由于 sin 需要 弧度，现在它应该按照您的预期打印 1。