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反三角函数（续）
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. The arctangent function
The arctangent function
2. Summary
Summary
3. Arctangent's domain and range
What are the arctangent's domain and range, and what does it approach as t grows?
4. Arctangent of minus one
What is the exact value of arctan(-1) in radians? Enter the coefficient of pi, e.g. "-1/4" for -pi/4.
5. Mixed inverse trigonometric values
Evaluate the composition arccos(sin(pi/3)) exactly, working from the inside outward.
6. Arctangent grows without bound
As its input grows without bound, arctangent also grows without bound.