Discovery of The Inverse Trig Functions

Does every function have an inverse?
Must the inverse of a function be a function?
How do we know if the inverse of a function, f(x), is also a function?
What measures can we take, if any, to turn an inverse relation into an inverse function?
Discovery of the Arcsine Function
What is an appropriate domain for [i]f[/i] or a range for [math]f^{-1}[/math] that would guarantee one output for every input?
Discovery of the Arccosine Function
What is an appropriate domain for [i]f[/i] or a range for [math]f^{-1}[/math] that would guarantee one output for every input?
What is an appropriate domain for [i]f[/i] or a range for [math]f^{-1}[/math] that would guarantee one output for every input?
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Information: Discovery of The Inverse Trig Functions