结果错误 [英] Wrong asin result

问题描述

我的代码:

import math
x = input()
print(math.asin(math.radians(float(x))))

我的x是0.7071067811865475，结果是0到1之间的某个无理数.但是据我所知，它应该在45左右.

My x was 0.7071067811865475, and the result was some irracional number between 0 and 1, but in my knowledge it should have been around 45

推荐答案

您使用错误的函数转换了错误的数字.

You're converting the wrong number with the wrong function.

>>> import math
>>> x = 0.7071067811865475
>>> math.degrees(math.asin(x))
44.99999999999999
>>>

也就是说，给定 x(角度的正弦)调用

That is, given x (which is the sine of an angle) call asin to compute the angle (in radians), and then use degrees to convert that angle to degrees.

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