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# solving e^2x + e^-2x watch

1. could anyone explain to me how to solve
4y^2 = e^2x + e^-2x

trying to prove arc coshx
2. (Original post by PiliPala)
could anyone explain to me how to solve
4y^2 = e^2x + e^-2x

trying to prove arc coshx
I suspect you've arrived at that position erroneously.

Starting from

we have,

I get the impression you attempted to square this; if so, you missed the cross terms.

Instead, rather than squaring, if you now multiply through by e^x, you get a quadratic in e^x. Apply the quadratic formula.

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Updated: November 1, 2015
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