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三角函数的反函数
一个未能通过水平线检验的周期函数，是否可能拥有反函数？
1. Introduction
Introduction
2. The arccosine function
The arccosine function
3. The arcsine function
The arcsine function
4. Arccosine values
What are arccos(1/2), arccos(sqrt(2)/2) and arccos(sqrt(3)/2)?
5. Arccosine in the second quadrant
What is the principal value of arccos(-1/2), in radians?
6. Composing cosine with arccosine
What are cos(arccos(-1/2)) and arccos(cos(7pi/6))?
7. Arcsine domain and values
What are arcsine's domain and range, and what is arcsin(sqrt(3)/2)?
8. Arccosine's range is the first two quadrants
The arccosine function returns values only between 0 and pi.
9. Arccosine of one half
What is arccos(1/2), in radians as a multiple of pi? Enter the coefficient, e.g. "1/3" for pi/3.