The hyperbolic function tanh y = _____?
- (e^y + e^(-y)) / (e^y - e^(-y))
- (e^y + e^(-y)) / (e^y + e^(-y))
- (e^y - e^(-y)) / (e^y + e^(-y))
- None of these
Explanation
The hyperbolic tangent function tanh(y) is defined as:
tanh(y) = (e^y - e^(-y)) / (e^y + e^(-y))
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