True or False:
For a trigonometric function, y = f(x), then x = F^-1(y). Explain your answer. (the capital F denotes function, not relation)
For a one-to-one function, y = f(x), then x = f^-1(y). Explain your answer.
For any function, x = f^-1(y), then y = f(x). Explain your answer.

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y=f(x) is invertable if and only if f(x) is one-one and onto

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