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Suppose x=(e^t+e^-t)/2 and y=(e^t-e^-t)/...

Suppose `x=(e^t+e^-t)/2` and `y=(e^t-e^-t)/2` are the parametric equations of a curve
Find `e^t` and `e^-t` in terms of x and y

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x+y, x-y
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